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The LGM-30 Minuteman is an American land-based
intercontinental ballistic missile An intercontinental ballistic missile (ICBM) is a ballistic missile with a range greater than , primarily designed for nuclear weapons delivery (delivering one or more thermonuclear warheads). Conventional, chemical, and biological weapons c ...
(ICBM) in service with the Air Force Global Strike Command. , the LGM-30G Minuteman III version is the only land-based ICBM in service in the United States and represents the land leg of the U.S.
nuclear triad A nuclear triad is a three-pronged military force structure that consists of land-launched nuclear missiles, nuclear-missile-armed submarines, and strategic aircraft with nuclear bombs and missiles. Specifically, these components are land-based ...
, along with the
Trident A trident is a three- pronged spear. It is used for spear fishing and historically as a polearm. The trident is the weapon of Poseidon, or Neptune, the God of the Sea in classical mythology. The trident may occasionally be held by other marine ...
submarine-launched ballistic missile A submarine-launched ballistic missile (SLBM) is a ballistic missile capable of being launched from submarines. Modern variants usually deliver multiple independently targetable reentry vehicles (MIRVs), each of which carries a nuclear warhead ...
(SLBM) and nuclear weapons carried by long-range
strategic bomber A strategic bomber is a medium- to long-range penetration bomber aircraft designed to drop large amounts of air-to-ground weaponry onto a distant target for the purposes of debilitating the enemy's capacity to wage war. Unlike tactical bombers, ...
s. Development of the Minuteman began in the mid-1950s when basic research indicated that a
solid-fuel rocket A solid-propellant rocket or solid rocket is a rocket with a rocket engine that uses solid propellants ( fuel/oxidizer). The earliest rockets were solid-fuel rockets powered by gunpowder; they were used in warfare by the Arabs, Chinese, Persian ...
motor could stand ready to launch for long periods of time, in contrast to
liquid-fueled rocket A liquid-propellant rocket or liquid rocket utilizes a rocket engine that uses liquid propellants. Liquids are desirable because they have a reasonably high density and high specific impulse (''I''sp). This allows the volume of the propellant ta ...
s that required fueling before launch and so might be destroyed in a surprise attack. The missile was named for the colonial
minutemen Minutemen were members of the organized New England colonial militia companies trained in weaponry, tactics, and military strategies during the American Revolutionary War. They were known for being ready at a minute's notice, hence the name. Mi ...
of the
American Revolutionary War The American Revolutionary War (April 19, 1775 – September 3, 1783), also known as the Revolutionary War or American War of Independence, was a major war of the American Revolution. Widely considered as the war that secured the independence of t ...
, who could be ready to fight on short notice. The Minuteman entered service in 1962 as a
deterrence Deterrence may refer to: * Deterrence theory, a theory of war, especially regarding nuclear weapons * Deterrence (penology), a theory of justice * Deterrence (psychology) Deterrence in relation to criminal offending is the idea or theory that t ...
weapon that could hit
Soviet The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, ...
cities with a
second strike In nuclear strategy, a retaliatory strike or second-strike capability is a country's assured ability to respond to a nuclear attack with powerful nuclear retaliation against the attacker. To have such an ability (and to convince an opponent of it ...
and
countervalue In military doctrine, countervalue is the targeting of an opponent's assets that are of value but not actually a military threat, such as cities and civilian populations. Counterforce is the targeting of an opponent's military forces and faciliti ...
counterattack if the U.S. was attacked. However, the development of the
United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...
(USN)
UGM-27 Polaris The UGM-27 Polaris missile was a two-stage solid-fueled nuclear-armed submarine-launched ballistic missile (SLBM). As the United States Navy's first SLBM, it served from 1961 to 1980. In the mid-1950s the Navy was involved in the Jupiter missile ...
, which addressed the same role, allowed the Air Force to modify the Minuteman, boosting its accuracy enough to attack hardened military targets, including Soviet missile silos. The Minuteman II entered service in 1965 with a host of upgrades to improve its accuracy and survivability in the face of an
anti-ballistic missile An anti-ballistic missile (ABM) is a surface-to-air missile designed to counter ballistic missiles (missile defense). Ballistic missiles are used to deliver nuclear weapon, nuclear, Chemical weapon, chemical, Bioagent, biological, or conventiona ...
(ABM) system the Soviets were known to be developing. In 1970, the Minuteman III became the first deployed ICBM with
multiple independently targetable reentry vehicle A multiple independently targetable reentry vehicle (MIRV) is an exoatmospheric ballistic missile payload containing several warheads, each capable of being aimed to hit a different target. The concept is almost invariably associated with in ...
s (MIRV): three smaller warheads that improved the missile's ability to strike targets defended by ABMs. They were initially armed with the
W62 The W62 was an American thermonuclear warhead designed in the 1960s and manufactured from March 1970 to June 1976. Used on some Minuteman III ICBMs, it was partially replaced by the W78 starting in December 1979, and fully replaced by W87 warhea ...
warhead with a yield of 170
kilotons TNT equivalent is a convention for expressing energy, typically used to describe the energy released in an explosion. The is a unit of energy defined by that convention to be , which is the approximate energy released in the detonation of a m ...
. By the 1970s, 1,000 Minuteman missiles were deployed. This force has shrunk to 400 Minuteman III missiles , deployed in
missile silo A missile launch facility, also known as an underground missile silo, launch facility (LF), or nuclear silo, is a vertical cylindrical structure constructed underground, for the storage and launching of intercontinental ballistic missiles (ICBMs ...
s around
Malmstrom AFB Malmstrom Air Force Base is a United States Air Force base and census-designated place (CDP) in Cascade County, Montana, United States, adjacent to the city of Great Falls. It was named in honor of World War II POW Colonel Einar Axel Malmstrom. ...
,
Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columbi ...
;
Minot AFB Minot Air Force Base is a U.S. Air Force installation in Ward County, North Dakota, north of the city of Minot via U.S. Route 83. In the 2020 census, the base was counted as a CDP with a total population of 5,017, down from 5,521 in ...
,
North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the Native Americans in the United States, indigenous Dakota people, Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north a ...
; and
Francis E. Warren AFB Francis E. Warren Air Force Base , shortened as F.E. Warren AFB is a United States Air Force base (AFB) located approximately west of Cheyenne, Wyoming. It is one of three strategic-missile bases in the U.S. It was named in honor of Francis E ...
,
Wyoming Wyoming () is a U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the south ...
. The Minuteman III will be progressively replaced by the new Ground Based Strategic Deterrent (GBSD) ICBM, to be built by
Northrop Grumman Northrop Grumman Corporation is an American multinational aerospace and defense technology company. With 90,000 employees and an annual revenue in excess of $30 billion, it is one of the world's largest weapons manufacturers and military techn ...
, beginning in 2030.


History


Edward Hall and solid fuels

Minuteman owes its existence largely to Air Force Colonel Edward N. Hall, who in 1956 was given charge of the solid-fuel-propulsion division of General Bernard Schriever's
Western Development Division Space Systems Command (SSC) is the United States Space Force's space development, acquisition, launch, and logistics field command. It is headquartered at Los Angeles Air Force Base, California and manages the United States' space launch r ...
, created to lead development of the
SM-65 Atlas The SM-65 Atlas was the first operational intercontinental ballistic missile (ICBM) developed by the United States and the first member of the Atlas rocket family. It was built for the U.S. Air Force by the Convair Division of General Dyna ...
and
HGM-25A Titan I The Martin Marietta SM-68A/HGM-25A Titan I was the United States' first multistage intercontinental ballistic missile (ICBM), in use from 1959 until 1962. Though the SM-68A was operational for only three years, it spawned numerous follow-on mo ...
ICBMs. Solid fuels were already commonly used in short-range rockets. Hall's superiors were interested in short- and
medium Medium may refer to: Science and technology Aviation *Medium bomber, a class of war plane *Tecma Medium, a French hang glider design Communication * Media (communication), tools used to store and deliver information or data * Medium of ...
-range missiles with solids, especially for use in Europe where the fast reaction time was an advantage for weapons that might be attacked by Soviet aircraft. But Hall was convinced that they could be used for a true ICBM with a range. To achieve the required energy, that year Hall began funding research at
Boeing The Boeing Company () is an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, telecommunications equipment, and missiles worldwide. The company also provides leasing and product ...
and
Thiokol Thiokol (variously Thiokol Chemical Corporation(/Company), Morton Thiokol Inc., Cordant Technologies Inc., Thiokol Propulsion, AIC Group, ATK Thiokol, ATK Launch Systems Group; finally Orbital ATK before becoming part of Northrop Grumman) was an ...
into the use of
ammonium perchlorate composite propellant Ammonium perchlorate composite propellant (APCP) is a solid-propellant rocket fuel. It differs from many traditional solid rocket propellants such as black powder or zinc-sulfur, not only in chemical composition and overall performance but a ...
. Adapting a concept developed in the UK, they cast the fuel into large cylinders with a star-shaped hole running along the inner axis. This allowed the fuel to burn along the entire length of the cylinder, rather than just the end as in earlier designs. The increased burn rate meant increased thrust. This also meant the heat was spread across the entire motor, instead of the end, and because it burned from the inside out it did not reach the wall of the missile fuselage until the fuel was finished burning. In comparison, older designs burned primarily from one end to the other, meaning that at any instant one small section of the fuselage was being subjected to extreme loads and temperatures. Guidance of an ICBM is based not only on the direction the missile is traveling but the precise instant that thrust is cut off. Too much thrust and the warhead will overshoot its target, too little and it will fall short. Solids are normally very hard to predict in terms of burn time and their instantaneous thrust during the burn, which made them questionable for the sort of accuracy required to hit a target at intercontinental range. While this initially appeared to be an insurmountable problem, it ended up being solved in an almost trivial fashion. A series of ports were added inside the rocket nozzle that were opened when the guidance systems called for engine cut-off. The reduction in pressure was so abrupt that the remaining fuel broke up and blew out the nozzle without contributing to the thrust. The first to use these developments was the US Navy. It had been involved in a joint program with the
US Army The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cla ...
to develop the liquid-fueled
PGM-19 Jupiter The PGM-19 Jupiter was the first nuclear armed, medium-range ballistic missile (MRBM) of the United States Air Force (USAF). It was a liquid-propellant rocket using RP-1 fuel and LOX oxidizer, with a single Rocketdyne LR79-NA (model S-3D) roc ...
, but had always been skeptical of the system. The Navy felt that liquid fuels were too dangerous to use on board ships, especially submarines. Rapid success in the solids development program, combined with
Edward Teller Edward Teller ( hu, Teller Ede; January 15, 1908 – September 9, 2003) was a Hungarian-American theoretical physicist who is known colloquially as "the father of the hydrogen bomb" (see the Teller–Ulam design), although he did not care fo ...
's promise of much lighter
nuclear warhead A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission bomb) or a combination of fission and fusion reactions ( thermonuclear bomb), producing a nuclear explosion. Both bom ...
s during
Project Nobska Project Nobska was a 1956 summer study on anti-submarine warfare (ASW) for the United States Navy ordered by Chief of Naval Operations Admiral Arleigh Burke. It is also referred to as the Nobska Study, named for its location on Nobska Point nea ...
, led the Navy to abandon Jupiter and begin development of their own solid-fuel missile. Aerojet's work with Hall was adapted for their
UGM-27 Polaris The UGM-27 Polaris missile was a two-stage solid-fueled nuclear-armed submarine-launched ballistic missile (SLBM). As the United States Navy's first SLBM, it served from 1961 to 1980. In the mid-1950s the Navy was involved in the Jupiter missile ...
starting in December 1956.


Missile farm concept

The US Air Force saw no pressing need for a solid fuel ICBM. Development of the
SM-65 Atlas The SM-65 Atlas was the first operational intercontinental ballistic missile (ICBM) developed by the United States and the first member of the Atlas rocket family. It was built for the U.S. Air Force by the Convair Division of General Dyna ...
and
SM-68 Titan The SM-68 Titan (individual variants later designated HGM-25 Titan I and LGM-25 Titan II) was the designation of two intercontinental ballistic missiles developed for the United States Air Force. The Titan I and Titan II missiles were operational b ...
ICBMs was progressing, and "storable" liquids were being developed that would allow missiles to be left in a ready-to-shoot form for extended periods. Hall saw solid fuels not only as a way to improve launch times or safety, but part of a radical plan to greatly reduce the cost of ICBMs so that thousands could be built. He was aware that new computerized
assembly line An assembly line is a manufacturing process (often called a ''progressive assembly'') in which parts (usually interchangeable parts) are added as the semi-finished assembly moves from workstation to workstation where the parts are added in seq ...
s would allow continual production, and that similar equipment would allow a small team to oversee operations for dozens or hundreds of missiles. A solid fuel design would be simpler to build, and easier to maintain. Hall's ultimate plan was to build a number of integrated missiles "farms" that included factories,
missile silos A missile launch facility, also known as an underground missile silo, launch facility (LF), or nuclear silo, is a vertical cylindrical structure constructed underground, for the storage and launching of intercontinental ballistic missiles (ICBM ...
, transport and recycling. Each farm would support between 1,000 and 1,500 missiles being produced in a continuous low rate cycle. Systems in a missile would detect failures, at which point it would be removed and recycled, while a newly built missile would take its place. The missile design was based purely on lowest possible cost, reducing its size and complexity because "the basis of the weapon's merit was its low cost per completed mission; all other factors – accuracy, vulnerability, and reliability – were secondary." Hall's plan did not go unopposed, especially by the more established names in the ICBM field. Ramo-Wooldridge pressed for a system with higher accuracy, but Hall countered that the missile's role was to attack Soviet cities, and that "a force which provides numerical superiority over the enemy will provide a much stronger deterrent than a numerically inferior force of greater accuracy." Hall was known for his "friction with others" and in 1958 Schriever removed him from the Minuteman project, sending him to the UK to oversee deployment of the Thor IRBM. On his return to the US in 1959, Hall retired from the Air Force, but received his second
Legion of Merit The Legion of Merit (LOM) is a military award of the United States Armed Forces that is given for exceptionally meritorious conduct in the performance of outstanding services and achievements. The decoration is issued to members of the eight ...
in 1960 for his work on solid fuels. Although he was removed from the Minuteman project, Hall's work on cost reduction had already produced a new design of diameter, much smaller than the Atlas and Titan at , which meant smaller and cheaper silos. Hall's goal of dramatic cost reduction was a success, although many of the other concepts of his missile farm were abandoned.


Guidance system

Previous long-range missiles used liquid fuels that could be loaded only just prior to firing. The loading process took from 30 to 60 minutes in typical designs. Although lengthy, this was not considered to be a problem at the time, because it took about the same amount of time to spin up the
inertial guidance system An inertial navigation system (INS) is a navigation device that uses motion sensors (accelerometers), rotation sensors ( gyroscopes) and a computer to continuously calculate by dead reckoning the position, the orientation, and the velocity (dire ...
, set the initial position, and program in the target coordinates. Minuteman was designed from the outset to be launched in minutes. While solid fuel eliminated the fueling delays, the delays in starting and aligning the guidance system remained. For the quick launch, the guidance system would have to be kept running and aligned at all times, which was a serious problem for the mechanical systems, especially the gyroscopes which used
ball bearing A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It achieves this ...
s.
Autonetics Autonetics was a division of North American Aviation that produced various avionics but is best known for their inertial navigation systems used in submarines and intercontinental ballistic missiles. Its 188-acre facility in Anaheim, California, ...
had an experimental design using air bearings that they claimed had been running continually from 1952 to 1957. Autonetics further advanced the
state of the art The state of the art (sometimes cutting edge or leading edge) refers to the highest level of general development, as of a device, technique, or scientific field achieved at a particular time. However, in some contexts it can also refer to a level ...
by building the platform in the form of a ball which could rotate in two directions. Conventional solutions used a shaft with ball bearings at either end that allowed it to rotate around a single axis only. Autonetics design meant that only two gyros would be needed for the inertial platform, instead of the typical three. The last major advance was to use a general-purpose digital computer in place of the analog or custom designed digital computers. Previous missile designs normally used two single-purpose and very simple computers; one ran the
autopilot An autopilot is a system used to control the path of an aircraft, marine craft or spacecraft without requiring constant manual control by a human operator. Autopilots do not replace human operators. Instead, the autopilot assists the operator' ...
that kept the missile flying along a programmed course, and the second compared the information from the inertial platform to the target coordinates and sent any needed corrections to the autopilot. To reduce the total number of parts used in Minuteman, a single faster computer was used, running separate routines for these functions. Since the guidance program would not be running while the missile sat in the silo, the same computer was also used to run a program that monitored the various sensors and test equipment. With older designs this had been handled by external systems, requiring miles of extra wiring and many connectors to locations where test instruments could be connected during servicing. Now these could all be accomplished by communicating with the computer through a single connection. In order to store multiple programs, the computer, the
D-17B The D-17B (D17B) computer was used in the Minuteman I NS-1OQ missile guidance system. The complete guidance system contained a D-17B computer, the associated stable platform, and power supplies. The D-17B weighed approximately , contained 1,521 ...
, was built in the form of a drum machine but used a
hard disk A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating platters coated with magnet ...
in place of the drum. Building a computer with the required performance, size and weight demanded the use of
transistor upright=1.4, gate (G), body (B), source (S) and drain (D) terminals. The gate is separated from the body by an insulating layer (pink). A transistor is a semiconductor device used to Electronic amplifier, amplify or electronic switch, switch e ...
s, which were at that time very expensive and not very reliable. Earlier efforts to use computers for guidance,
BINAC BINAC (Binary Automatic Computer) was an early electronic computer designed for Northrop Aircraft Company by the Eckert–Mauchly Computer Corporation (EMCC) in 1949. Eckert and Mauchly, though they had started the design of EDVAC at the Unive ...
and the system on the
SM-64 Navaho The North American SM-64 Navaho was a supersonic intercontinental cruise missile project built by North American Aviation (NAA). The final design was capable of delivering a nuclear weapon to the USSR from bases within the US, while cruising at ...
, had failed and were abandoned. The Air Force and Autonetics spent millions on a program to improve transistor and component reliability 100 times, leading to the "Minuteman high-rel parts" specifications. The techniques developed during this program were equally useful for improving all transistor construction, and greatly reduced the failure rate of transistor production lines in general. This improved yield, which had the effect of greatly lowering production costs, had enormous spin-off effects in the electronics industry. Using a general-purpose computer also had long-lasting effects on the Minuteman program and the US's nuclear stance in general. With Minuteman, the targeting could be easily changed by loading new trajectory information into the computer's hard drive, a task that could be completed in a few hours. Earlier ICBMs' custom wired computers, on the other hand, could have attacked only a single target, whose precise trajectory information was hard-coded directly in the system's logic.


Missile gap

In 1957, a series of intelligence reports suggested the Soviet Union was far ahead in the missile race and would be able to overwhelm the US by the early 1960s. If the Soviets were building missiles in the numbers being predicted by the CIA and others within the defense establishment, by as early as 1961 they would have enough to attack all SAC and ICBM bases in the US in a single first strike. It was later demonstrated that this "
missile gap In the United States, during the Cold War, the missile gap was the perceived superiority of the number and power of the USSR's missiles in comparison with those of the U.S. (a lack of military parity). The gap in the ballistic missile arsenals di ...
" was just as fictional as the "
bomber gap The bomber gap was the Cold War belief that the Soviet Union's Long Range Aviation department had gained an advantage in deploying jet-powered strategic bombers. Widely accepted for several years, the gap was used as a political talking point i ...
" of a few years earlier, but through the late 1950s, it was a serious concern. The Air Force responded by beginning research into survivable strategic missiles, starting the
WS-199 Weapons System 199 (WS-199) was a weapons development program conducted by the United States Air Force to research and develop new strategic weapons systems for Strategic Air Command. Two air-launched and one ground-launched vehicles were developed ...
program. Initially, this focused on
air-launched ballistic missile An air-launched ballistic missile or ALBM is a ballistic missile launched from an aircraft. An ALBM allows the launch aircraft to stand off at long distances from its target, keeping it well outside the range of defensive weapons like anti-aircra ...
s, which would be carried aboard aircraft flying far from the Soviet Union, and thus impossible to attack by either ICBM, because they were moving, or long-range
interceptor aircraft An interceptor aircraft, or simply interceptor, is a type of fighter aircraft designed specifically for the defensive interception role against an attacking enemy aircraft, particularly bombers and reconnaissance aircraft. Aircraft that are cap ...
, because they were too far away. In the shorter term, looking to rapidly increase the number of missiles in its force, Minuteman was given crash development status starting in September 1958. Advanced surveying of the potential silo sites had already begun in late 1957. Adding to their concerns was a Soviet
anti-ballistic missile An anti-ballistic missile (ABM) is a surface-to-air missile designed to counter ballistic missiles (missile defense). Ballistic missiles are used to deliver nuclear weapon, nuclear, Chemical weapon, chemical, Bioagent, biological, or conventiona ...
system which was known to be under development at
Sary Shagan Sary Shagan ( rus, Сары-Шаган; kz, Сарышаған) is an anti-ballistic missile testing range located in Kazakhstan. On 17 August 1956 the Council of Ministers of the Soviet Union authorized plans for an experimental facility for ...
. WS-199 was expanded to develop a
maneuvering reentry vehicle The maneuverable reentry vehicle (abbreviated MARV or MaRV) is a type of warhead for ballistic missiles that is capable of maneuvring and changing its trajectory. MaRV can be capable of autonomously tracking ground targets to make sure the mis ...
(MARV), which greatly complicated the problem of shooting down a warhead. Two designs were tested in 1957,
Alpha Draco The Alpha Draco missile, also known as Weapons System 199D (WS-199D), was an experimental ballistic missile developed by McDonnell Aircraft in the late 1950s to investigate the aerodynamic physics of the boost-glide reentry trajectory. Three test ...
and the Boost Glide Reentry Vehicle. These used long and skinny arrow-like shapes that provided aerodynamic lift in the high atmosphere, and could be fitted to existing missiles like Minuteman. The shape of these reentry vehicles required more room on the front of the missile than a traditional reentry vehicle design. To allow for this future expansion, the Minuteman silos were revised to be built deeper. Although Minuteman would not deploy a
boost-glide Non-ballistic atmospheric entry is a class of atmospheric entry trajectories that follow a non-ballistic trajectory by employing aerodynamic lift in the high upper atmosphere. It includes trajectories such as skip and glide. Skip is a flight tr ...
warhead, the extra space proved invaluable in the future, as it allowed the missile to be extended and carry more fuel and payload.


Polaris

During Minuteman's early development, the Air Force maintained the policy that the manned
strategic bomber A strategic bomber is a medium- to long-range penetration bomber aircraft designed to drop large amounts of air-to-ground weaponry onto a distant target for the purposes of debilitating the enemy's capacity to wage war. Unlike tactical bombers, ...
was the primary weapon of nuclear war. Blind bombing accuracy on the order of was expected, and the weapons were sized to ensure even the hardest targets would be destroyed as long as the weapon fell within this range. The USAF had enough bombers to attack every military and industrial target in the USSR and was confident that its bombers would survive in sufficient numbers that such a strike would utterly destroy the country. Soviet ICBMs upset this equation to a degree. Their accuracy was known to be low, on the order of , but they carried large warheads that would be useful against
Strategic Air Command Strategic Air Command (SAC) was both a United States Department of Defense Specified Command and a United States Air Force (USAF) Major Command responsible for command and control of the strategic bomber and intercontinental ballistic missile ...
's bombers, which parked in the open. Since there was no system to detect the ICBMs being launched, the possibility was raised that the Soviets could launch a sneak attack with a few dozen missiles that would take out a significant portion of SAC's bomber fleet. In this environment, the Air Force saw their own ICBMs not as a primary weapon of war, but as a way to ensure that the Soviets would not risk a sneak attack. ICBMs, especially newer models that were housed in silos, could be expected to survive an attack by a single Soviet missile. In any conceivable scenario where both sides had similar numbers of ICBMs, the US forces would survive a sneak attack in sufficient numbers to ensure the destruction of all major Soviet cities in return. The Soviets would not risk an attack under these conditions. Considering this ''
countervalue In military doctrine, countervalue is the targeting of an opponent's assets that are of value but not actually a military threat, such as cities and civilian populations. Counterforce is the targeting of an opponent's military forces and faciliti ...
'' attack concept, strategic planners calculated that an attack of "400 equivalent megatons" aimed at the largest Soviet cities would promptly kill 30% of their population and destroy 50% of their industry. Larger attacks raised these numbers only slightly, as all of the larger targets would already have been hit. This suggested that there was a " finite deterrent" level around 400 megatons that would be enough to prevent a Soviet attack no matter how many missiles they had of their own. All that had to be ensured was that the US missiles survived, which seemed likely given the low accuracy of the Soviet weapons. Reversing the problem, the addition of ICBMs to the US Air Force's arsenal did not eliminate the need, or desire, to attack Soviet military targets, and the Air Force maintained that bombers were the only suitable platform in that role. Into this argument came the Navy's
UGM-27 Polaris The UGM-27 Polaris missile was a two-stage solid-fueled nuclear-armed submarine-launched ballistic missile (SLBM). As the United States Navy's first SLBM, it served from 1961 to 1980. In the mid-1950s the Navy was involved in the Jupiter missile ...
. Launched from submarines, Polaris was effectively invulnerable and had enough accuracy to attack Soviet cities. If the Soviets improved the accuracy of their missiles this would present a serious threat to the Air Force's bombers and missiles, but none at all to the Navy's submarines. Based on the same 400 equivalent megatons calculation, they set about building a fleet of 41 submarines carrying 16 missiles each, giving the Navy a finite deterrent that was unassailable. This presented a serious problem for the Air Force. They were still pressing for the development of newer bombers, like the supersonic B-70, for attacks against military targets, but this role seemed increasingly unlikely in a nuclear war scenario. A February 1960 memo by
RAND The RAND Corporation (from the phrase "research and development") is an American nonprofit global policy think tank created in 1948 by Douglas Aircraft Company to offer research and analysis to the United States Armed Forces. It is finan ...
, entitled "The Puzzle of Polaris", was passed around among high-ranking Air Force officials. It suggested that Polaris negated any need for Air Force ICBMs if they were also being aimed at Soviet cities. If the role of the missile was to present an unassailable threat to the Soviet population, Polaris was a far better solution than Minuteman. The document had long-lasting effects on the future of the Minuteman program, which, by 1961, was firmly evolving towards a
counterforce In nuclear strategy, a counterforce target is one that has a military value, such as a launch silo for intercontinental ballistic missiles, an airbase at which nuclear-armed bombers are stationed, a homeport for ballistic missile submarines, or ...
capability.


Kennedy

Minuteman's final tests coincided with
John F. Kennedy John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to by his initials JFK and the nickname Jack, was an American politician who served as the 35th president of the United States from 1961 until his assassination ...
entering the White House. His new Secretary of Defense,
Robert McNamara Robert Strange McNamara (; June 9, 1916 – July 6, 2009) was an American business executive and the eighth United States Secretary of Defense, serving from 1961 to 1968 under Presidents John F. Kennedy and Lyndon B. Johnson. He remains the Lis ...
, was tasked with continuing the expansion and modernisation of the US nuclear deterrent while limiting spending. McNamara began to apply cost/benefit analysis, and Minuteman's low production cost made its selection a foregone conclusion. Atlas and Titan were soon scrapped, and the storable liquid fueled Titan II deployment was severely curtailed. McNamara also cancelled the B-70 bomber project. Minuteman's low cost had spin-off effects on non-ICBM programs. The Army's
Nike Zeus Nike Zeus was an anti-ballistic missile (ABM) system developed by the US Army during the late 1950s and early 1960s that was designed to destroy incoming Soviet intercontinental ballistic missile warheads before they could hit their targets. It ...
, an interceptor missile capable of shooting down Soviet warheads, provided another way to prevent a sneak attack. This had initially been proposed as a way to defend the SAC bomber fleet. The Army argued that upgraded Soviet missiles might be able to attack US missiles in their silos, and Zeus would be able to blunt such an attack. Zeus was expensive and the Air Force said it was more cost-effective to build another Minuteman missile. Given the large size and complexity of the Soviet liquid-fueled missiles, an ICBM building race was one the Soviets could not afford. Zeus was canceled in 1963.


Counterforce

Minuteman's selection as the primary Air Force ICBM was initially based on the same "
second strike In nuclear strategy, a retaliatory strike or second-strike capability is a country's assured ability to respond to a nuclear attack with powerful nuclear retaliation against the attacker. To have such an ability (and to convince an opponent of it ...
" logic as their earlier missiles: that the weapon was primarily one designed to survive any potential Soviet attack and ensure they would be hit in return. But Minuteman had a combination of features that led to its rapid evolution into the US's primary weapon of nuclear war. Chief among these qualities was its digital computer. This could be updated in the field with new targets and better information about the flight paths with relative ease, gaining accuracy for little cost. One of the unavoidable effects on the warhead's trajectory was the mass of the Earth, which contains many mass concentrations that pull on the warhead as it passes over them. Through the 1960s, the Defense Mapping Agency (now part of
National Geospatial-Intelligence Agency The National Geospatial-Intelligence Agency (NGA) is a combat support agency within the United States Department of Defense whose primary mission is collecting, analyzing, and distributing geospatial intelligence (GEOINT) in support of national ...
) mapped these with increasing accuracy, feeding that information back into the Minuteman fleet. The Minuteman was initially deployed with a
circular error probable In the military science of ballistics, circular error probable (CEP) (also circular error probability or circle of equal probability) is a measure of a weapon system's precision. It is defined as the radius of a circle, centered on the mean, wh ...
(CEP) of about , but this had improved to about by 1965. This was accomplished without any mechanical changes to the missile or its navigation system. At those levels, the ICBM begins to approach the manned bomber in terms of accuracy; a small upgrade, roughly doubling the accuracy of the INS, would give it the same CEP as the manned bomber. Autonetics began such development even before the original Minuteman entered fleet service, and the Minuteman II had a CEP of . Additionally, the computers were upgraded with more memory, allowing them to store information for eight targets, which the missile crews could select among almost instantly, greatly increasing their flexibility. From that point, Minuteman became the US's primary deterrent weapon, until its performance was matched by the Navy's
Trident missile The Trident missile is a submarine-launched ballistic missile (SLBM) equipped with multiple independently targetable reentry vehicles (MIRV). Originally developed by Lockheed Missiles and Space Corporation, the missile is armed with thermon ...
of the 1980s. Questions about the need for the manned bomber were quickly raised. The Air Force began to offer a number of reasons why the bomber offered value, in spite of costing more money to buy and being much more expensive to operate and maintain. Newer bombers with better survivability, like the B-70, cost many times more than the Minuteman, and, in spite of great efforts through the 1960s, became increasingly vulnerable to
surface-to-air missile A surface-to-air missile (SAM), also known as a ground-to-air missile (GTAM) or surface-to-air guided weapon (SAGW), is a missile designed to be launched from the ground to destroy aircraft or other missiles. It is one type of anti-aircraft syst ...
s. The B-1 of the early 1970s eventually emerged with a price tag around $200 million (equivalent to $ million in ) while the Minuteman IIIs built during the 1970s cost only $7 million ($ million in ). The Air Force countered that having a variety of platforms complicated the defense; if the Soviets built an effective
anti-ballistic missile An anti-ballistic missile (ABM) is a surface-to-air missile designed to counter ballistic missiles (missile defense). Ballistic missiles are used to deliver nuclear weapon, nuclear, Chemical weapon, chemical, Bioagent, biological, or conventiona ...
system of some sort, the ICBM and SLBM fleet might be rendered useless, while the bombers would remain. This became the
nuclear triad A nuclear triad is a three-pronged military force structure that consists of land-launched nuclear missiles, nuclear-missile-armed submarines, and strategic aircraft with nuclear bombs and missiles. Specifically, these components are land-based ...
concept, which survives into the present. Although this argument was successful, the number of manned bombers has been repeatedly cut and the deterrent role increasingly passed to missiles.


Minuteman I (LGM-30A/B or SM-80/HSM-80A)

:''See also W56 Warhead''


Deployment

The LGM-30A Minuteman I was first test-fired on 1 February 1961 at
Cape Canaveral , image = cape canaveral.jpg , image_size = 300 , caption = View of Cape Canaveral from space in 1991 , map = Florida#USA , map_width = 300 , type =Cape , map_caption = Location in Florida , location ...
, and entered into the
Strategic Air Command Strategic Air Command (SAC) was both a United States Department of Defense Specified Command and a United States Air Force (USAF) Major Command responsible for command and control of the strategic bomber and intercontinental ballistic missile ...
's arsenal in 1962. After the first batch of Minuteman I's were fully developed and ready for stationing, the
United States Air Force The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Signal ...
(USAF) had originally decided to put the missiles at
Vandenberg AFB Vandenberg Space Force Base , previously Vandenberg Air Force Base, is a United States Space Force Base in Santa Barbara County, California. Established in 1941, Vandenberg Space Force Base is a space launch base, launching spacecraft from th ...
in California, but before the missiles were set to officially be moved there it was discovered that this first set of Minuteman missiles had defective boosters which limited their range from their initial to . This defect would cause the missiles to fall short of their targets if launched over the
North Pole The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where the Earth's axis of rotation meets its surface. It is called the True North Pole to distinguish from the Mag ...
as planned. The decision was made to station the missiles at
Malmstrom AFB Malmstrom Air Force Base is a United States Air Force base and census-designated place (CDP) in Cascade County, Montana, United States, adjacent to the city of Great Falls. It was named in honor of World War II POW Colonel Einar Axel Malmstrom. ...
in
Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columbi ...
instead. These changes would allow the missiles, even with their defective boosters, to reach their intended targets in the case of a launch. The "improved" LGM-30B Minuteman I became operational at
Ellsworth AFB Ellsworth Air Force Base (AFB) is a United States Air Force base located about northeast of Rapid City, South Dakota, just north of the town of Box Elder, South Dakota, Box Elder. The host unit at Ellsworth is the 28th Bomb Wing (28 BW). Assi ...
,
South Dakota South Dakota (; Sioux language, Sioux: , ) is a U.S. state in the West North Central states, North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Lakota people, Lakota and Dakota peo ...
,
Minot AFB Minot Air Force Base is a U.S. Air Force installation in Ward County, North Dakota, north of the city of Minot via U.S. Route 83. In the 2020 census, the base was counted as a CDP with a total population of 5,017, down from 5,521 in ...
,
North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the Native Americans in the United States, indigenous Dakota people, Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north a ...
, F.E. Warren AFB,
Wyoming Wyoming () is a U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the south ...
, and
Whiteman AFB Whiteman Air Force Base is a United States Air Force base located just south of Knob Noster, Missouri, United States. The base is the current home of the B-2 Spirit bomber. It is named for 2nd Lt George Whiteman, who was killed during the attac ...
,
Missouri Missouri is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it is bordered by eight states (tied for the most with Tennessee ...
, in 1963 and 1964. All 800 Minuteman I missiles were delivered by June 1965. Each of the bases had 150 missiles emplaced; F.E. Warren had 200 of the Minuteman IB missiles. Malmstrom had 150 of the Minuteman I, and about five years later added 50 of the Minuteman II similar to those installed at
Grand Forks AFB Grand Forks Air Force Base (AFB) is a United States Air Force installation in northeastern North Dakota, located north of Emerado and west of Grand Forks. The host unit is the 319th Reconnaissance Wing (319 RW) assigned to the Air Combat C ...
, ND.


Specifications

The Minuteman I's length varied based on which variation one was to look at. The Minuteman I/A had a length of and the Minuteman I/B had a length of . The Minuteman I weighed roughly , had an operational range of with an accuracy of about .


Guidance

The Minuteman I Autonetics D-17 flight computer used a rotating air bearing magnetic disk holding 2,560 "cold-stored"
words A word is a basic element of language that carries an objective or practical meaning, can be used on its own, and is uninterruptible. Despite the fact that language speakers often have an intuitive grasp of what a word is, there is no consen ...
in 20 tracks (write heads disabled after program fill) of 24 bits each and one alterable track of 128 words. The time for a D-17 disk revolution was 10 ms. The D-17 also used a number of short loops for faster access to intermediate results storage. The D-17 computational minor cycle was three disk revolutions or 30 ms. During that time all recurring computations were performed. For ground operations, the inertial platform was aligned and gyro correction rates updated. During a flight, filtered command outputs were sent by each minor cycle to the engine nozzles. Unlike modern computers, which use descendants of that technology for secondary storage on
hard disk A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating platters coated with magnet ...
, the disk was the active
computer memory In computing, memory is a device or system that is used to store information for immediate use in a computer or related computer hardware and digital electronic devices. The term ''memory'' is often synonymous with the term ''primary storage ...
. The disk storage was considered hardened to radiation from nearby nuclear explosions, making it an ideal storage medium. To improve computational speed, the D-17 borrowed an instruction look-ahead feature from the Autonetics-built Field Artillery Data Computer (
M18 FADAC The gun data computer was a series of fire control system, artillery computers used by the U.S. Army for coastal artillery, field artillery and anti-aircraft artillery applications. In antiaircraft applications they were used in conjunction with a ...
) that permitted simple instruction execution every word time.


Warhead

At its introduction into service in 1962, Minuteman I was fitted with the
W59 The W59 was an American thermonuclear warhead used on some Minuteman I ICBM missiles from 1962 to 1969, and planned to be used on the cancelled GAM-87 Skybolt air-launched ballistic missile. History Minuteman application Development of the Minu ...
warhead with a yield of 1 Mt. Production for the W56 warhead with a 1.2 Mt yield began in March 1963 and W59 production was ended in July 1963 with a production run of only 150 warheads before being retired in June 1969. The W56 would continue production until May 1969 with a production run of 1000 warheads. Mods 0 to 3 were retired by September 1966 and the Mod 4 version would remain in service until the 1990s. It's not clear exactly why the W59 was replaced by the W56 after deployment but issues with "... one-point safety" and "performance under aged conditions" were cited in a 1987 Congressional report regarding the warhead.
Chuck Hansen Chuck Hansen (May 13, 1947 - March 26, 2003) was the compiler, over a period of 30 years, of the world's largest private collection of unclassified documents on how America developed atomic and thermonuclear weapons. Research Hansen's documents ...
alleged that all weapons sharing the "Tsetse" nuclear primary design including the W59 suffered from a critical one-point safety issue and suffered premature tritium aging issues that needed to be corrected after entry into service.


Minuteman II (LGM-30F)

:''See also W56 warhead'' The LGM-30F Minuteman II was an improved version of the Minuteman I missile. Its first test launch took place on September 24, 1964. Development on the Minuteman II began in 1962 as the Minuteman I entered the Strategic Air Command's nuclear force. Minuteman II production and deployment began in 1965 and completed in 1967. It had an increased range, greater
throw weight A ballistic missile is a type of missile that uses projectile motion to deliver warheads on a target. These weapons are guided only during relatively brief periods—most of the flight is unpowered. Short-range ballistic missiles stay within t ...
and guidance system with better azimuthal coverage, providing military planners with better accuracy and a wider range of targets. Some missiles also carried penetration aids, allowing the higher probability of kill against Moscow's anti-ballistic missile system. The payload consisted of a single Mk-11C reentry vehicle containing a
W56 The W56 (originally called the Mark 56) was an American thermonuclear warhead produced starting in 1963 which saw service until 1993, on the Minuteman I and II ICBMs. The warhead had a yield of and a demonstrated yield-to-weight ratio of , ve ...
nuclear warhead with a yield of 1.2 megatons of TNT (5 PJ).


Specifications

The Minuteman II had a length of , weighed roughly , had an operational range of with an accuracy of about . The major new features provided by Minuteman II were: * An improved first-stage motor to increase reliability. * A novel, single, fixed
nozzle A nozzle is a device designed to control the direction or characteristics of a fluid flow (specially to increase velocity) as it exits (or enters) an enclosed chamber or pipe. A nozzle is often a pipe or tube of varying cross sectional area, a ...
with liquid injection thrust vector control on a larger second-stage motor to increase missile range. Additional motor improvements to increase reliability. * An improved guidance system (the D-37 flight computer), incorporating
microchips An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, usually silicon. Large numbers of tiny M ...
and miniaturized discrete electronic parts. Minuteman II was the first program to make a major commitment to these new devices. Their use made possible multiple target selection, greater accuracy and reliability, a reduction in the overall size and weight of the guidance system, and an increase in the survivability of the guidance system in a nuclear environment. The guidance system contained 2,000 microchips made by
Texas Instruments Texas Instruments Incorporated (TI) is an American technology company headquartered in Dallas, Texas, that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globall ...
. * A penetration aids system to camouflage the warhead during its reentry into an enemy environment. In addition, the Mk-11C reentry vehicle incorporated stealth features to reduce its radar signature and make it more difficult to distinguish from decoys. The Mk-11C was no longer made of titanium for this and other reasons. * A larger warhead in the reentry vehicle to increase kill probability. System modernization was concentrated on launch facilities and
command and control Command and control (abbr. C2) is a "set of organizational and technical attributes and processes ... hatemploys human, physical, and information resources to solve problems and accomplish missions" to achieve the goals of an organization or en ...
facilities. This provided decreased reaction time and increased survivability when under nuclear attack. Final changes to the system were performed to increase compatibility with the expected
LGM-118A Peacekeeper The LGM-118 Peacekeeper, originally known as the MX for "Missile, Experimental", was a MIRV-capable intercontinental ballistic missile (ICBM) produced and deployed by the United States from 1985 to 2005. The missile could carry up to twelve Mar ...
. These newer missiles were later deployed into modified Minuteman silos. The Minuteman II program was the first mass-produced system to use a computer constructed from integrated circuits (the
Autonetics Autonetics was a division of North American Aviation that produced various avionics but is best known for their inertial navigation systems used in submarines and intercontinental ballistic missiles. Its 188-acre facility in Anaheim, California, ...
D-37C The D-37C (D37C) is the computer component of the all-inertial NS-17 Missile Guidance Set (MGS) for accurately navigating to its target thousands of miles away. The NS-17 MGS was used in the Minuteman II (LGM-30F) ICBM. The MGS, originally designe ...
). The Minuteman II integrated circuits were
diode–transistor logic Diode–transistor logic (DTL) is a class of digital circuits that is the direct ancestor of transistor–transistor logic. It is called so because the logic gating function (e.g., AND) is performed by a diode network and the amplifying function ...
and
diode logic Diode logic (DL), or diode-resistor logic (DRL), is the construction of Boolean logic gates from diodes. Diode logic was used extensively in the construction of early computers, where semiconductor diodes could replace bulky and costly active v ...
made by
Texas Instruments Texas Instruments Incorporated (TI) is an American technology company headquartered in Dallas, Texas, that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globall ...
. The other major customer of early integrated circuits was the
Apollo Guidance Computer The Apollo Guidance Computer (AGC) was a digital computer produced for the Apollo program that was installed on board each Apollo command module (CM) and Apollo Lunar Module (LM). The AGC provided computation and electronic interfaces for guidan ...
, which had similar weight and ruggedness constraints. The Apollo integrated circuits were
resistor–transistor logic Resistor–transistor logic (RTL) (sometimes also transistor–resistor logic (TRL)) is a class of digital circuits built using resistors as the input network and bipolar junction transistors (BJTs) as switching devices. RTL is the earliest class o ...
made by
Fairchild Semiconductor Fairchild Semiconductor International, Inc. was an American semiconductor company based in San Jose, California. Founded in 1957 as a division of Fairchild Camera and Instrument, it became a pioneer in the manufacturing of transistors and of int ...
. The Minuteman II flight computer continued to use rotating magnetic disks for primary storage. The Minuteman II included
diode A diode is a two-terminal electronic component that conducts current primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance in one direction, and high (ideally infinite) resistance in the other. A diode ...
s by
Microsemi Corporation Microsemi Corporation was an Aliso Viejo, California-based provider of semiconductor and system solutions for aerospace & defense, communications, data center and industrial markets. In February 2018, it was announced that Chandler, Arizona-base ...
.


Minuteman III (LGM-30G)

:''See also W62 warhead'' The LGM-30G Minuteman III program started in 1966 and included several improvements over the previous versions. Its first test launch took place on August 16, 1968. It was first deployed in 1970. Most modifications related to the final stage and reentry system (RS). The final (third) stage was improved with a new fluid-injected motor, giving finer control than the previous four-nozzle system. Performance improvements realized in Minuteman III include increased flexibility in reentry vehicle (RV) and penetration aids deployment, increased survivability after a nuclear attack, and increased payload capacity. The missile retains a
gimbal A gimbal is a pivoted support that permits rotation of an object about an axis. A set of three gimbals, one mounted on the other with orthogonal pivot axes, may be used to allow an object mounted on the innermost gimbal to remain independent of ...
led
inertial navigation system An inertial navigation system (INS) is a navigation device that uses motion sensors (accelerometers), rotation sensors ( gyroscopes) and a computer to continuously calculate by dead reckoning the position, the orientation, and the velocity (dire ...
. Minuteman III originally contained the following distinguishing features: * Armed with up to three
W62 The W62 was an American thermonuclear warhead designed in the 1960s and manufactured from March 1970 to June 1976. Used on some Minuteman III ICBMs, it was partially replaced by the W78 starting in December 1979, and fully replaced by W87 warhea ...
Mk-12 warheads, having a yield of only 170 kilotons TNT, instead of previous
W56 The W56 (originally called the Mark 56) was an American thermonuclear warhead produced starting in 1963 which saw service until 1993, on the Minuteman I and II ICBMs. The warhead had a yield of and a demonstrated yield-to-weight ratio of , ve ...
's yield of 1.2 megatons. * It was the first Multiple Independently Targetable Reentry Vehicles MIRV missile. A single missile was then able to target three separate locations. This was an improvement from the Minuteman I and Minuteman II models, which were able to carry only one large warhead. ** An RS capable of deploying, in addition to the warheads,
penetration aid A penetration aid (or "penaid") is a device or tactic used to increase an intercontinental ballistic missile (ICBM) warhead's chances of penetrating a target's defenses. These can consist of both ''physical devices'' carried within the ICBM (as p ...
s such as
chaff Chaff (; ) is the dry, scaly protective casing of the seeds of cereal grains or similar fine, dry, scaly plant material (such as scaly parts of flowers or finely chopped straw). Chaff is indigestible by humans, but livestock can eat it. In agri ...
and
decoy A decoy (derived from the Dutch ''de'' ''kooi'', literally "the cage" or possibly ''ende kooi'', " duck cage") is usually a person, device, or event which resembles what an individual or a group might be looking for, but it is only meant to lu ...
s. ** Minuteman III introduced in the post-boost-stage ("bus") an additional liquid-fuel propulsion system rocket engine (PSRE) that is used to slightly adjust the
trajectory A trajectory or flight path is the path that an object with mass in motion follows through space as a function of time. In classical mechanics, a trajectory is defined by Hamiltonian mechanics via canonical coordinates; hence, a complete traj ...
. This enables it to dispense decoys or – with MIRV – dispense individual RVs to separate targets. For the PSRE it uses the bipropellant Rocketdyne RS-14 engine. * The Hercules M57 third stage of Minuteman I and Minuteman II had thrust termination ports on the sides. These ports, when opened by detonation of shaped charges, reduced the chamber pressure so abruptly that the interior flame was blown out. This allowed a precisely timed termination of thrust for targeting accuracy. The larger Minuteman III third-stage motor also has thrust termination ports although the final velocity is determined by PSRE. * A fixed nozzle with a liquid injection thrust vector control system on the new third-stage motor (similar to the second-stage Minuteman II nozzle) additionally increased range. * A flight computer (Autonetics
D37D {{Short description, Military flight computer The D37D Minuteman III flight computer was initially supplied with the LGM-30G missile, as part of the NS-20 navigation system. The NS-20 D37D flight computer is a miniaturized general purpose (serial ...
) with larger disk memory and enhanced capability. ** A Honeywell HDC-701 flight computer which employed non-destructive readout
plated wire memory Plated-wire memory is a variation of core memory developed by Bell Laboratories in 1957. Its primary advantage was that it could be machine-assembled, which potentially led to lower prices than the almost always hand-assembled core. Instead of t ...
instead of rotating magnetic disk for primary storage was developed as a backup for the D37D but was never adopted. ** The Guidance Replacement Program, initiated in 1993, replaced the disk-based D37D flight computer with a new one that uses radiation-resistant
semiconductor A semiconductor is a material which has an electrical resistivity and conductivity, electrical conductivity value falling between that of a electrical conductor, conductor, such as copper, and an insulator (electricity), insulator, such as glas ...
RAM Ram, ram, or RAM may refer to: Animals * A male sheep * Ram cichlid, a freshwater tropical fish People * Ram (given name) * Ram (surname) * Ram (director) (Ramsubramaniam), an Indian Tamil film director * RAM (musician) (born 1974), Dutch * ...
. The Minuteman III missiles used D-37D computers and completed the 1,000 missile deployment of this system. The initial cost of these computers ranged from about $139,000 (D-37C) to $250,000 (D-17B). The existing Minuteman III missiles have been further improved over the decades in service, with more than $7 billion spent in the 2010s to upgrade the 450 missiles.


Specifications

The Minuteman III has a length of , weighs , an operational range of , and an accuracy of about .


W78 warhead

In December 1979 the higher-yield W78 warhead (335–350 kilotons) began replacing a number of the W62s deployed on the Minuteman IIIs. These were delivered in the Mark 12A reentry vehicle. A small, unknown number of the previous Mark 12 RVs were retained operationally, however, to maintain a capability to attack more-distant targets in the south-central Asian republics of the
USSR The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nationa ...
(the Mark 12 RV weighed slightly less than the Mark 12A).


Guidance Replacement Program

The Guidance Replacement Program replaces the NS20A Missile Guidance Set with the NS50 Missile Guidance Set. The newer system extends the service life of the Minuteman missile beyond the year 2030 by replacing aging parts and assemblies with current, high reliability technology while maintaining the current accuracy performance. The replacement program was completed 25 February 2008.


Propulsion Replacement Program

Beginning in 1998 and continuing through 2009, the Propulsion Replacement Program extends the life and maintains the performance by replacing the old solid propellant boosters (downstages).


Single Reentry Vehicle

The Single Reentry Vehicle modification enabled the United States ICBM force to abide by the now-voided START II treaty requirements by reconfiguring Minuteman III missiles from three reentry vehicles down to one. Though it was eventually ratified by both parties, START II never entered into force and was essentially superseded by follow-on agreements such as
SORT Sort may refer to: * Sorting, any process of arranging items in sequence or in sets ** Sorting algorithm, any algorithm for arranging elements in lists ** Sort (Unix), a Unix utility which sorts the lines of a file ** Sort (C++), a function in the ...
and New START, which do not limit MIRV capability. Minuteman III remains fitted with a single warhead due to the warhead limitations in New START.


Safety Enhanced Reentry Vehicle

Beginning in 2005, Mk-21/
W87 The W87 is an American thermonuclear missile warhead formerly deployed on the LGM-118A Peacekeeper ("MX") ICBM. 50 MX missiles were built, each carrying up to 10 W87 warheads in multiple independently targetable reentry vehicles (MIRV), and were ...
RVs from the deactivated Peacekeeper missile were replaced on the Minuteman III force under the Safety Enhanced Reentry Vehicle (SERV) program. The older W78 did not have many of the safety features of the newer W87, such as insensitive high explosives, as well as more advanced safety devices. In addition to implementing these safety features in at least a portion of the future Minuteman III force, the decision to transfer W87s onto the missile was based on two features that improved the targeting capabilities of the weapon: more fuzing options which allowed for greater targeting flexibility, and the most accurate reentry vehicle available, which provided a greater probability of damage to the designated targets.


Deployment

The Minuteman III missile entered service in 1970, with weapon systems upgrades included during the production run from 1970 to 1978 to increase accuracy and payload capacity. , the USAF plans to operate it until 2030. The
LGM-118A Peacekeeper The LGM-118 Peacekeeper, originally known as the MX for "Missile, Experimental", was a MIRV-capable intercontinental ballistic missile (ICBM) produced and deployed by the United States from 1985 to 2005. The missile could carry up to twelve Mar ...
(MX) ICBM, which was to have replaced the Minuteman, was retired in 2005 as part of START II. A total of 450 LGM-30G missiles are emplaced at F.E. Warren Air Force Base,
Wyoming Wyoming () is a U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the south ...
(
90th Missile Wing The 90th Missile Wing is a component of Twentieth Air Force, stationed at Francis E. Warren Air Force Base and equipped with LGM-30G Minuteman III Missiles. It has served at Warren as a component of Strategic Air Command, Air Combat Command, A ...
),
Minot Air Force Base Minot Air Force Base is a U.S. Air Force installation in Ward County, North Dakota, north of the city of Minot via U.S. Route 83. In the 2020 census, the base was counted as a CDP with a total population of 5,017, down from 5,521 i ...
,
North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the Native Americans in the United States, indigenous Dakota people, Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north a ...
( 91st Missile Wing), and
Malmstrom Air Force Base Malmstrom Air Force Base is a United States Air Force base and census-designated place (CDP) in Cascade County, Montana, United States, adjacent to the city of Great Falls. It was named in honor of World War II POW Colonel Einar Axel Malmstrom. ...
,
Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columbi ...
( 341st Missile Wing). All Minuteman I and Minuteman II missiles have been retired. The United States prefers to keep its MIRV deterrents on submarine-launched Trident Nuclear Missiles In 2014, the Air Force decided to put fifty Minuteman III silos into "warm" unarmed status, taking up half of the 100 slots in America's allowable nuclear reserve. These can be reloaded in the future if necessary.


Testing

Minuteman III missiles are regularly tested with launches from
Vandenberg Space Force Base Vandenberg Space Force Base , previously Vandenberg Air Force Base, is a United States Space Force Base in Santa Barbara County, California. Established in 1941, Vandenberg Space Force Base is a space launch base, launching spacecraft from th ...
in order to validate the effectiveness, readiness, and accuracy of the weapon system, as well as to support the system's primary purpose,
nuclear deterrence Deterrence theory refers to the scholarship and practice of how threats or limited force by one party can convince another party to refrain from initiating some other course of action. The topic gained increased prominence as a military strategy ...
. The safety features installed on the Minuteman III for each test launch allow the flight controllers to terminate the flight at any time if the systems indicate that its course may take it unsafely over inhabited areas. Since these flights are for test purposes only, even terminated flights can send back valuable information to correct a potential problem with the system. The 576th Flight Test Squadron is responsible for planning, preparing, conducting, and assessing all ICBM ground and flight tests.


Airborne Launch Control System (ALCS)

The Airborne Launch Control System (ALCS) is an integral part of the Minuteman ICBM command and control system and provides a survivable launch capability for the Minuteman ICBM force if ground-based launch control centers (LCCs) are destroyed. When the Minuteman ICBM was first placed on alert, the Soviet Union did not have the number of weapons, accuracy, nor significant nuclear yield to completely destroy the Minuteman ICBM force during an attack. However, starting in the mid-1960s, the Soviets began to gain parity with the US and now had the potential capability to target and successfully attack the Minuteman force with an increased number of ICBMs that had greater yields and accuracy than were previously available. Studying the problem, SAC realized that in order to prevent the US from launching all 1,000 Minuteman ICBMs, the Soviets did not have to target all 1,000 Minuteman missile silos. The Soviets needed to launch only a disarming decapitation strike against the 100 Minuteman LCCs – the command and control sites – in order to prevent the launch of all Minuteman ICBMs. Even though the Minuteman ICBMs would have been left unscathed in their missile silos following an LCC decapitation strike, the Minuteman missiles could not be launched without a command and control capability. In other words, the Soviets needed only 100 warheads to fully eliminate command and control of the Minuteman ICBMs. Even if the Soviets chose to expend two to three warheads per LCC for assured damage expectancy, the Soviets would have had to expend only up to 300 warheads to disable the Minuteman ICBM force – far less than the total number of Minuteman silos. The Soviets could have then used the remaining warheads to strike other targets they chose. Faced with only a few Minuteman LCC targets, the Soviets could have concluded that the odds of being successful in a Minuteman LCC decapitation strike were higher with less risk than it would have been having to face the almost insurmountable task of successfully attacking and destroying 1000 Minuteman silos and 100 Minuteman LCCs to ensure Minuteman was disabled. This theory motivated SAC to design a survivable means to launch Minuteman, even if all the ground-based command and control sites were destroyed. After thorough testing and modification of EC-135 command post aircraft, the ALCS demonstrated its capability on 17 April 1967 by launching an ERCS configured Minuteman II out of Vandenberg AFB, CA. Afterward, ALCS achieved Initial Operational Capability on 31 May 1967. From that point on, airborne missileers stood alert with ALCS-capable EC-135 aircraft for several decades. All Minuteman ICBM Launch Facilities were modified and built to have the capability to receive commands from ALCS. With ALCS now standing alert around-the-clock, the Soviets could no longer successfully launch a Minuteman LCC decapitation strike. Even if the Soviets attempted to do so, EC-135s equipped with the ALCS could fly overhead and launch the remaining Minuteman ICBMs in retaliation. Now that the ALCS was on alert, this complicated Soviet war planning by forcing the Soviets to target not only the 100 LCCs, but also the 1,000 silos with more than one warhead in order to guarantee destruction. This would have required upwards of 3,000 warheads to complete such an attack. The odds of being successful in such an attack on the Minuteman ICBM force would have been extremely low. Today, the ALCS is operated by airborne missileers from the Air Force Global Strike Command's (AFGSC)
625th Strategic Operations Squadron The 625th Strategic Operations Squadron (STOS) is a United States Air Force nuclear missile control & support squadron. The 625th STOS has five flights that play different roles in this mission. The Latin motto of the 625th STOS is ''Si vis pacem ...
(STOS) and
United States Strategic Command United States Strategic Command (USSTRATCOM) is one of the eleven unified combatant commands in the United States Department of Defense. Headquartered at Offutt Air Force Base, Nebraska, USSTRATCOM is responsible for strategic nuclear deterr ...
(USSTRATCOM). The weapon system is now located on board the United States Navy's
E-6B Mercury The Boeing E-6 Mercury (formerly Hermes) is an airborne command post and communications relay based on the Boeing 707. The original E-6A manufactured by Boeing's defense division entered service with the United States Navy in July 1989, repla ...
. The ALCS crew is integrated into the battle staff of the USSTRATCOM " Looking Glass" Airborne Command Post (ABNCP) and is on alert around-the-clock. Although the Minuteman ICBM force has been reduced since the end of the Cold War, the ALCS continues to act as a force multiplier by ensuring that an adversary cannot launch a successful Minuteman LCC decapitation strike.


Other roles


Mobile Minuteman

Mobile Minuteman was a program for rail-based ICBMs to help increase survivability and for which the USAF released details on 12 October 1959. The
Operation Big Star A Minuteman Mobility Test Train was a Cold War train for Strategic Air Command testing before deployment of planned trains for launching Minuteman missiles which were to allow periodic movement for security from targeting by the Soviet missile fo ...
performance test was from 20 June to 27 August 1960 at Hill Air Force Base, and the 4062nd Strategic Missile Wing (Mobile) was organized 1 December 1960 for 3 planned missile train squadrons, each with 10 trains carrying 3 missiles per train. During the Kennedy/McNamara cutbacks, the Department of Defense announced "that it has abandoned the plan for a mobile Minuteman ICBM. The concept called for 600 to be placed in service—450 in silos and 150 on special trains, each train carrying 5 missiles." Kennedy announced on 18 March 1961 that the 3 squadrons were to be replaced with "fixed-base squadrons", and Strategic Air Command discontinued the 4062nd Strategic Missile Wing on 20 February 1962.


Air Launched ICBM

Air Launched ICBM was a STRAT-X proposal in which SAMSO (Space & Missile Systems Organization) successfully conducted an Air Mobile Feasibility Test that
airdrop An airdrop is a type of airlift in which items including weapons, equipment, humanitarian aid or leaflets are delivered by military or civilian aircraft without their landing. Developed during World War II to resupply otherwise inaccessible tr ...
ped a Minuteman 1b from a C-5A Galaxy aircraft from over the
Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...
. The missile fired at , and the 10-second engine burn carried the missile to 20,000 feet again before it dropped into the ocean. Operational deployment was discarded due to engineering and security difficulties, and the capability was a negotiating point in the
Strategic Arms Limitation Talks The Strategic Arms Limitation Talks (SALT) were two rounds of bilateral conferences and corresponding international treaties involving the United States and the Soviet Union. The Cold War superpowers dealt with arms control in two rounds of ta ...
.


Emergency Rocket Communications System (ERCS)

From 1963 through 1991 the National Command Authority communication relay system included the Emergency Rocket Communication System (ERCS). Specially designed rockets called BLUE SCOUT carried radio-transmitting payloads high above the continental United States, to relay messages to units within line-of-sight. In the event of a nuclear attack, ERCS payloads would relay pre-programmed messages giving the "go-order" to SAC units. BLUE SCOUT launch sites were located at Wisner, West Point and Tekamah,
Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwe ...
. These locations were vital for ERCS effectiveness due to their centralized position in the US, within range of all missile complexes. In 1968, ERCS configurations were placed on the top of modified Minuteman II ICBMs (LGM-30Fs) under the control of the 510th Strategic Missile Squadron located at
Whiteman Air Force Base Whiteman Air Force Base is a United States Air Force base located just south of Knob Noster, Missouri, United States. The base is the current home of the B-2 Spirit bomber. It is named for 2nd Lt George Whiteman, who was killed during the attack ...
,
Missouri Missouri is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it is bordered by eight states (tied for the most with Tennessee ...
. The Minuteman ERCS may have been assigned the designation LEM-70A.


Satellite launching role

The U.S. Air Force has considered using some decommissioned Minuteman missiles in a satellite launching role. These missiles would be stored in silos, for launch upon short notice. The payload would be variable and would have the ability to be replaced quickly. This would allow a surge capability in times of emergency. During the 1980s, surplus Minuteman missiles were used to power the Conestoga rocket produced by Space Services Inc. of America. It was the first privately funded rocket, but saw only three flights and was discontinued due to a lack of business. More recently, converted Minuteman missiles have been used to power the Minotaur line of rockets produced by
Orbital Sciences Orbital Sciences Corporation (commonly referred to as Orbital) was an American company specializing in the design, manufacture, and launch of small- and medium- class space and launch vehicle systems for commercial, military and other governmen ...
(nowadays
Northrop Grumman Innovation Systems Northrop Grumman Innovation Systems (NGIS) was a sector (business segment) of Northrop Grumman from 2018 through 2019. It was formed from Orbital ATK Inc. a company which resulted from the merger of Orbital Sciences Corporation and parts of Alli ...
).


Ground and air launch targets

L-3 Communications is currently using SR-19 SRBs, Minuteman II Second Stage Solid Rocket Boosters, as delivery vehicles for a range of different re-entry vehicles as targets for the THAAD and ASIP interceptor missile programs as well as radar testing.


Operators

: The
United States Air Force The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Signal ...
has been the only operator of the Minuteman ICBM weapons system, currently with three operational wings and one test squadron operating the LGM-30G. The active inventory in FY 2009 is 450 missiles and 45 Missile Alert Facilities (MAF).


Operational units

The basic tactical unit of a Minuteman wing is the squadron, consisting of five flights. Each flight consists of ten unmanned launch facilities (LFs) which are remotely controlled by a manned launch control center (LCC). A two-officer crew is on duty in the LCC, typically for 24 hours. The five flights are interconnected and status from any LF may be monitored by any of the five LCCs. Each LF is located at least three nautical miles (5.6 km) from any LCC. Control does not extend outside the squadron (thus the 319th Missile Squadron's five LCCs cannot control the 320th Missile Squadron's 50 LFs even though they are part of the same Missile Wing). Each Minuteman wing is assisted logistically by a nearby Missile Support Base (MSB). If the ground-based LCCs are destroyed or incapacitated, the Minuteman ICBMs can be launched by airborne missileers utilizing the Airborne Launch Control System.


Active

*
90th Missile Wing The 90th Missile Wing is a component of Twentieth Air Force, stationed at Francis E. Warren Air Force Base and equipped with LGM-30G Minuteman III Missiles. It has served at Warren as a component of Strategic Air Command, Air Combat Command, A ...
 – "Mighty Ninety" ** at
Francis E. Warren AFB Francis E. Warren Air Force Base , shortened as F.E. Warren AFB is a United States Air Force base (AFB) located approximately west of Cheyenne, Wyoming. It is one of three strategic-missile bases in the U.S. It was named in honor of Francis E ...
,
Wyoming Wyoming () is a U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the south ...
, (1 July 1963 – present) ** Units: *** 319th Missile Squadron – "Screaming Eagles" *** 320th Missile Squadron – "G.N.I." *** 321st Missile Squadron – "Greentails" ** 150 missiles, 15 MAF –
Launch sites This article constitutes a list of rocket launch sites. Some of these sites are known as spaceports or cosmodromes. A single rocket launch is sufficient for inclusion in the table, as long as the site is properly documented through a reference. M ...
*** LGM-30B Minuteman I, 1964–74 *** LGM-30G Minuteman III, 1973–present * 91st Missile Wing – "Roughriders" ** at
Minot AFB Minot Air Force Base is a U.S. Air Force installation in Ward County, North Dakota, north of the city of Minot via U.S. Route 83. In the 2020 census, the base was counted as a CDP with a total population of 5,017, down from 5,521 in ...
,
North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the Native Americans in the United States, indigenous Dakota people, Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north a ...
(25 June 1968 – present) ** Units: *** 740th Missile Squadron – "Vulgar Vultures" *** 741st Missile Squadron – "Gravelhaulers" *** 742d Missile Squadron – "Wolf Pack" ** 150 Missiles, 15 MAF –
Launch sites This article constitutes a list of rocket launch sites. Some of these sites are known as spaceports or cosmodromes. A single rocket launch is sufficient for inclusion in the table, as long as the site is properly documented through a reference. M ...
*** LGM-30B Minuteman I, 1968–72 *** LGM-30G Minuteman III, 1972–present * 341st Missile Wing ** at
Malmstrom AFB Malmstrom Air Force Base is a United States Air Force base and census-designated place (CDP) in Cascade County, Montana, United States, adjacent to the city of Great Falls. It was named in honor of World War II POW Colonel Einar Axel Malmstrom. ...
,
Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columbi ...
(15 July 1961 – present) ** Units: *** 10th Missile Squadron – "First Aces" *** 12th Missile Squadron – "Red Dawgs" *** 490th Missile Squadron – "Farsiders" ** 150 Missiles, 15 MAF –
Launch sites This article constitutes a list of rocket launch sites. Some of these sites are known as spaceports or cosmodromes. A single rocket launch is sufficient for inclusion in the table, as long as the site is properly documented through a reference. M ...
*** LGM-30A Minuteman I, 1962–69 *** LGM-30F Minuteman II, 1967–94 *** LGM-30G Minuteman III, 1975–present *
625th Strategic Operations Squadron The 625th Strategic Operations Squadron (STOS) is a United States Air Force nuclear missile control & support squadron. The 625th STOS has five flights that play different roles in this mission. The Latin motto of the 625th STOS is ''Si vis pacem ...
** at
Offutt AFB Offutt Air Force Base is a U.S. Air Force base south of Omaha, adjacent to Bellevue in Sarpy County, Nebraska. It is the headquarters of the U.S. Strategic Command (USSTRATCOM), the 557th Weather Wing, and the 55th Wing (55 WG) of the Air ...
,
Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwe ...


Historical

* 44th Strategic Missile (later Missile) Wing "Black Hills Bandits" :
Ellsworth AFB Ellsworth Air Force Base (AFB) is a United States Air Force base located about northeast of Rapid City, South Dakota, just north of the town of Box Elder, South Dakota, Box Elder. The host unit at Ellsworth is the 28th Bomb Wing (28 BW). Assi ...
,
South Dakota South Dakota (; Sioux language, Sioux: , ) is a U.S. state in the West North Central states, North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Lakota people, Lakota and Dakota peo ...
(24 November 1961 – 5 July 1994) : LGM-30B Minuteman I, 1963–73 : LGM-30F Minuteman II, 1971–94 : 66th Missile Squadron : 67th Missile Squadron : 68th Missile Squadron : 44th Missile Wing LGM-30 Minuteman Missile Launch Sites : Inactivated 1994 when Minuteman II phased out of inventory. All retired between 3 December 1991 and April 1994, with destruction of silos and alert facilities finishing in 1996. *
90th Missile Wing The 90th Missile Wing is a component of Twentieth Air Force, stationed at Francis E. Warren Air Force Base and equipped with LGM-30G Minuteman III Missiles. It has served at Warren as a component of Strategic Air Command, Air Combat Command, A ...
: 400th Missile Squadron (Converted to
LGM-118A Peacekeeper The LGM-118 Peacekeeper, originally known as the MX for "Missile, Experimental", was a MIRV-capable intercontinental ballistic missile (ICBM) produced and deployed by the United States from 1985 to 2005. The missile could carry up to twelve Mar ...
in 1987. Inactivated 2005. Peacekeepers retired.) * 321st Strategic Missile (later Missile) Wing (later Group) :
Grand Forks AFB Grand Forks Air Force Base (AFB) is a United States Air Force installation in northeastern North Dakota, located north of Emerado and west of Grand Forks. The host unit is the 319th Reconnaissance Wing (319 RW) assigned to the Air Combat C ...
,
North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the Native Americans in the United States, indigenous Dakota people, Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north a ...
(14 August 1964 – 30 September 1998) : LGM-30F Minuteman II, 1965–73 : LGM-30G Minuteman III, 1972–98 : 446th Missile Squadron : 447th Missile Squadron : 448th Missile Squadron : 321st Missile Wing LGM-30 Minuteman Missile Launch Sites : Inactivated by BRAC 1995; missiles reassigned to 341st SMW, however in 1995 it was decided to retire the Grand Forks missiles; the last missile was pulled from its silo in June 1998. Destruction of silos and control facilities began in October 1999; the last silo (H-22) was imploded 24 August 2001 (the last US silo destroyed per the 1991 START-I treaty). * 341st Missile Wing : 564th Missile Squadron (Inactivated 2008, WS-133B system retired, missiles recycled into inventory) * 351st Strategic Missile (later Missile) Wing :
Whiteman AFB Whiteman Air Force Base is a United States Air Force base located just south of Knob Noster, Missouri, United States. The base is the current home of the B-2 Spirit bomber. It is named for 2nd Lt George Whiteman, who was killed during the attac ...
,
Missouri Missouri is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it is bordered by eight states (tied for the most with Tennessee ...
(1 February 1963 – 31 July 1995) : LGM-30B Minuteman I, 1963–65 : LGM-30F Minuteman II, 1965–95 :
508th Missile Squadron The 508th Missile Squadron is an inactive United States Air Force unit. It was last assigned to the 351st Operations Group at Whiteman Air Force Base, Missouri. The squadron was equipped with the LGM-30F Minuteman II Intercontinental ballist ...
:
509th Missile Squadron The 509th Missile Squadron is an inactive United States Air Force unit. It was last assigned to the 351st Operations Group at Whiteman Air Force Base, Missouri. The squadron was equipped with the LGM-30F Minuteman II Intercontinental ballisti ...
:
510th Missile Squadron The 510th Missile Squadron is an inactive United States Air Force unit. It was last assigned to the 351st Operations Group at Whiteman Air Force Base, Missouri. The squadron was equipped with the LGM-30F Minuteman II Intercontinental ballist ...
:
351st Missile Wing LGM-30 Minuteman Missile Launch Sites This is a list of the LGM-30 Minuteman missile Missile Alert Facilities and Launch Facilities of the 351st Strategic Missile Wing, 20th Air Force, assigned to Whiteman AFB, Missouri. Overview The 351st Strategic Missile Wing was the third Unit ...
: The 510th SMS operated Emergency Rocket Communication System (ERCS) missiles in addition to Minuteman II ICBMs. The 351st SMW was inactivated under START-I. The first silo was imploded on 8 December 1993 and the last on 15 December 1997. *
455th Strategic Missile Wing 455th may refer to: *455th Air Expeditionary Wing, provisional United States Air Force USAFCENT unit *455th Flying Training Squadron, United States Air Force unit of the Air Education and Training Command (AETC) See also

*455 (number) *455 (di ...
:
Minot AFB Minot Air Force Base is a U.S. Air Force installation in Ward County, North Dakota, north of the city of Minot via U.S. Route 83. In the 2020 census, the base was counted as a CDP with a total population of 5,017, down from 5,521 in ...
,
North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the Native Americans in the United States, indigenous Dakota people, Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north a ...
(28 June 1962 – 25 June 1968) : LGM-30B Minuteman I, 1962–68 : Replaced by the 91st Strategic Missile Wing in June 1968 * Historical Airborne Launch Control System Units :
68th Strategic Missile Squadron The 68th Missile Squadron (68 MS) is an inactive United States Air Force unit. It was last assigned to the 44th Operations Group, stationed at Ellsworth AFB, South Dakota. The 68 MS was equipped with the LGM-30F Minuteman II Intercontinental ...
(Ellsworth AFB, SD: 1967–1970) : 91st Strategic Missile Wing (Minot AFB, ND: 1967–1969) opkins III, Robert S. 1997. Boeing KC-135 Stratotanker: More Than Just a Tanker. Leicester, England: Midland Publishing Limited, p. 196/ref> : 4th Airborne Command and Control Squadron (Ellsworth AFB, SD: 1970–1992) opkins III, Robert S. 1997. Boeing KC-135 Stratotanker: More Than Just a Tanker. Leicester, England: Midland Publishing Limited, p. 116/ref> : 2nd Airborne Command and Control Squadron (Offutt AFB, NE: 1970–1994) :
7th Airborne Command and Control Squadron The 7th Expeditionary Airborne Command and Control Squadron is part of the 379th Air Expeditionary Wing at Al Udeid Air Base, Qatar. It operates the E-8 Joint STARS aircraft, conducting airborne command and control missions. The squadron has ...
(Offutt AFB, NE: 1994–1998) : 625th Missile Operations Flight/
USSTRATCOM United States Strategic Command (USSTRATCOM) is one of the eleven unified combatant commands in the United States Department of Defense. Headquartered at Offutt Air Force Base, Nebraska, USSTRATCOM is responsible for strategic nuclear deterr ...
(Offutt AFB, NE: 1998–2007) : Converted to the
625th Strategic Operations Squadron The 625th Strategic Operations Squadron (STOS) is a United States Air Force nuclear missile control & support squadron. The 625th STOS has five flights that play different roles in this mission. The Latin motto of the 625th STOS is ''Si vis pacem ...
in 2007, where ALCS mission continues to this day


Support

* 532d Training Squadron – Vandenberg AFB, California (Missile Maintenance Training and Missile Initial Qualification Course) * 315th Weapons Squadron
Nellis AFB Nellis Air Force Base ("Nellis" colloq.) is a United States Air Force installation in southern Nevada. Nellis hosts air combat exercises such as Exercise Red Flag and close air support exercises such as Green Flag-West flown in " Military Op ...
,
Nevada Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...
(ICBM Weapons Instructor Course) * 526th ICBM Systems WingHill Air Force Base,
Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to it ...
* 576th Flight Test Squadron – Vandenberg Air Force Base, California – "Top Hand" *
625th Strategic Operations Squadron The 625th Strategic Operations Squadron (STOS) is a United States Air Force nuclear missile control & support squadron. The 625th STOS has five flights that play different roles in this mission. The Latin motto of the 625th STOS is ''Si vis pacem ...
Offutt AFB Offutt Air Force Base is a U.S. Air Force base south of Omaha, adjacent to Bellevue in Sarpy County, Nebraska. It is the headquarters of the U.S. Strategic Command (USSTRATCOM), the 557th Weather Wing, and the 55th Wing (55 WG) of the Air ...
,
Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwe ...


Replacement

A request for proposal for development and maintenance of a Ground Based Strategic Deterrent (GBSD) next-generation nuclear ICBM, was made by the US Air Force Nuclear Weapons Center, ICBM Systems Directorate, GBSD Division on 29 July 2016. The GBSD would replace MMIII in the land-based portion of the US Nuclear Triad. The new missile to be phased in over a decade from the late 2020s are estimated over a fifty-year life cycle to cost around $86 billion. Boeing, Lockheed Martin, and Northrop Grumman were competing for the contract. On 21 August 2017, the US Air Force awarded 3-year development contracts to Boeing and Northrop Grumman, for $349 million and $329 million, respectively. One of these companies will be selected to produce this ground-based nuclear ICBM in 2020. In 2027, the GBSD program is expected to enter service and remain active until 2075. On 14 December 2019, it was announced that Northrop Grumman had won the competition to build the future ICBM. Northrop won by default, as their bid was at the time the only bid left to be considered for the GBSD program (Boeing had dropped out of the bidding contest earlier in 2019). The US Air Force said: "The Air Force will proceed with an aggressive and effective sole-source negotiation." in reference to Northrop's bid.


Surviving decommissioned sites

* Oscar One Alert Facility at
Whiteman AFB Whiteman Air Force Base is a United States Air Force base located just south of Knob Noster, Missouri, United States. The base is the current home of the B-2 Spirit bomber. It is named for 2nd Lt George Whiteman, who was killed during the attac ...
* Delta One Alert Facility at
Minuteman Missile National Historic Site The Minuteman Missile National Historic Site is an American national historic site established in 1999 near Wall, South Dakota to illustrate the history and significance of the Cold War, the arms race, and intercontinental ballistic missile ...
* Delta Nine Silo at
Minuteman Missile National Historic Site The Minuteman Missile National Historic Site is an American national historic site established in 1999 near Wall, South Dakota to illustrate the history and significance of the Cold War, the arms race, and intercontinental ballistic missile ...
* Minuteman II missile Training Launch Facility at
Ellsworth AFB Ellsworth Air Force Base (AFB) is a United States Air Force base located about northeast of Rapid City, South Dakota, just north of the town of Box Elder, South Dakota, Box Elder. The host unit at Ellsworth is the 28th Bomb Wing (28 BW). Assi ...
* Oscar Zero Alert Facility at
Ronald Reagan Minuteman Missile State Historic Site The Ronald Reagan Minuteman Missile State Historic Site consists of two former missile sites around Cooperstown, North Dakota that were part of North Dakota military activities during the Cold War years: the Oscar-Zero Missile Alert Facility and ...
* November 33 Silo (topside only) at
Ronald Reagan Minuteman Missile State Historic Site The Ronald Reagan Minuteman Missile State Historic Site consists of two former missile sites around Cooperstown, North Dakota that were part of North Dakota military activities during the Cold War years: the Oscar-Zero Missile Alert Facility and ...
*
Quebec-One Missile Alert Facility The Quebec-One Missile Alert Facility, also known as Quebec-01 or Q-01, located 30 miles north of Cheyenne, Wyoming, near Chugwater, was a United States Air Force ICBM launch control facility. It was operated by the 400th Missile Squadron cons ...
at Cheyenne, Wyoming (modified for Peacekeeper ICBM in 1986)


Preservation

The
Minuteman Missile National Historic Site The Minuteman Missile National Historic Site is an American national historic site established in 1999 near Wall, South Dakota to illustrate the history and significance of the Cold War, the arms race, and intercontinental ballistic missile ...
in
South Dakota South Dakota (; Sioux language, Sioux: , ) is a U.S. state in the West North Central states, North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Lakota people, Lakota and Dakota peo ...
preserves a Launch Control Facility (D-01) and a launch facility (D-09) under the control of the
National Park Service The National Park Service (NPS) is an agency of the United States federal government within the U.S. Department of the Interior that manages all national parks, most national monuments, and other natural, historical, and recreational propertie ...
. The North Dakota State Historical Society maintains the Ronald Reagan Minuteman Missile Site, preserving a Missile Alert Facility, Launch Control Center and Launch Facility in the WS-133B "Deuce" configuration, near
Cooperstown Cooperstown is a village in and county seat of Otsego County, New York, United States. Most of the village lies within the town of Otsego, but some of the eastern part is in the town of Middlefield. Located at the foot of Otsego Lake in the C ...
,
North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the Native Americans in the United States, indigenous Dakota people, Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north a ...
.


Comparable missiles

* DF-5 *
DF-41 The Dongfeng-41 (DF-41, CSS-20) () is a fourth-generation Chinese solid-fuelled road-mobile intercontinental ballistic missile operated by the People's Liberation Army Rocket Force (formerly the Second Artillery Corps). DF-41 is the fourth and ...
*
PGM-17 Thor The PGM-17A Thor was the first operational ballistic missile of the United States Air Force (USAF). Named after the Norse god of thunder, it was deployed in the United Kingdom between 1959 and September 1963 as an intermediate-range ballistic m ...
* R-36 *
RS-24 Yars The RS-24 Yars (РС-24 Ярс– ракета стратегическая (strategic missile)) - modification 24) also known as RT-24 Yars or Topol'-MR (russian: PC-24 «Ярс», NATO reporting name: SS-29 or SS-27 Mod 2) is a Russian MIRV-e ...
*
RT-2 The RT-2 was an intercontinental ballistic missile deployed by the Soviet Union, which was in service from December 1968 until 1976. It was assigned the NATO reporting name SS-13 Savage and carried the GRAU index 8K98. Designed by OKB-1, about 60 ...
*
RT-2PM2 Topol-M The RT-2PM2 «Topol-M» (russian: РТ-2ПМ2 «Тополь-М», NATO reporting name: SS-27 "Sickle B", other designations: SS-27 Mod 1, RS-12M1, RS-12M2, formerly incorrectly RT-2UTTKh) is one of the most recent intercontinental ballistic missi ...
*
UR-100N The UR-100N, also known as RS-18A is an intercontinental ballistic missile in service with Soviet and Russian Strategic Missile Troops. The missile was given the NATO reporting name SS-19 Stiletto and carries the industry designation 15A30. Deve ...
*
Agni-V Agni-V is a nuclear capable intercontinental ballistic missile developed by the Defence Research and Development Organisation RDOof India. The missile is believed to have a range of around 5,000 to 5,500 kilometers. Scientists and experts say ...


See also

*
Airborne Launch Control Center Airborne Launch Control Centers (ALCC—pronounced "Al-see") provide a survivable launch capability for the United States Air Force's LGM-30 Minuteman Intercontinental Ballistic Missile (ICBM) force by utilizing the Airborne Launch Control Syste ...
* LGM-30 Minuteman chronology *
Missile combat crew A missile combat crew (MCC), is a team of highly trained specialists, often called missileers, staffing Intermediate Range and Intercontinental ballistic missile systems (IRBMs and ICBMs, respectively). In the United States, personnel, officially c ...
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Missile launch control center A launch control center (LCC), in the United States, is the main control facility for intercontinental ballistic missiles (ICBMs). A launch control center monitors and controls missile launch facilities. From a launch control center, the mis ...
*
Nuclear weapons and the United States The United States was the first country to manufacture nuclear weapons and is the only country to have used them in combat, with the bombings of Hiroshima and Nagasaki in World War II. Before and during the Cold War, it conducted 1,054 nucle ...
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Single Integrated Operational Plan The Single Integrated Operational Plan (SIOP) was the United States' general plan for nuclear war from 1961 to 2003. The SIOP gave the President of the United States a range of targeting options, and described launch procedures and target sets a ...
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List of missiles Below is a list of missiles, sorted alphabetically into large categories and subcategories by name and purpose. Other missile lists Types of missiles: * Conventional guided missiles ** Air-to-air missile ** Air-to-surface missile ** Anti-radiat ...


Notes


References


Citations


Sources

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Further reading

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External links


CSIS Missile Threat – Minuteman III
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Minuteman Information Site
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60 Minutes shocked to find 8-inch floppies drive nuclear deterrent
– ''
Ars Technica ''Ars Technica'' is a website covering news and opinions in technology, science, politics, and society, created by Ken Fisher and Jon Stokes in 1998. It publishes news, reviews, and guides on issues such as computer hardware and software, sci ...
'' {{DEFAULTSORT:Lgm-30 Minuteman 1974 in spaceflight Cold War weapons of the United States Embedded systems LGM-030 Nuclear weapons of the United States MIRV capable missiles Military equipment introduced in the 1960s