The LGM-118 Peacekeeper, originally known as the MX for "Missile, Experimental", was a
MIRV
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 i ...
-capable
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) produced and deployed by the
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
from 1985 to 2005. The missile could carry up to twelve Mark 21
reentry vehicles (although treaties limited its actual payload to 10), each armed with a 300-
kiloton
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 t ...
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 ...
warhead
A warhead is the forward section of a device that contains the explosive agent or toxic (biological, chemical, or nuclear) material that is delivered by a missile, rocket, torpedo, or bomb.
Classification
Types of warheads include:
* Explosiv ...
. Initial plans called for building and deploying 100 MX ICBMs, but budgetary concerns eliminated the final procurement; only 50 entered service. Disarmament treaties signed after the Peacekeeper's development led to its withdrawal from service in 2005.
Studies on the underlying concept started in the 1960s. The idea was to allow the U.S. to absorb a sneak attack by the USSR with enough warheads surviving to attack the remaining Soviet missile silos. To do so, the missiles had to be highly accurate, be based in such a way that enough would survive a nuclear attack, carry a large number of warheads so the survivors would still inflict massive damage, and be able to rapidly re-target so they could be aimed at only those missiles the Soviets had not yet fired. Ultimately, the only problem that was never completely solved was the issue of basing; over its development through the 1970s, MX emerged as a highly accurate, rapid-firing, and quickly retargeted system.
Initial development began in 1971, with full-scale development starting in 1974. President
Jimmy Carter
James Earl Carter Jr. (born October 1, 1924) is an American politician who served as the 39th president of the United States from 1977 to 1981. A member of the Democratic Party (United States), Democratic Party, he previously served as th ...
ordered initial production in 1979 but was overturned by Congress. After considerable debate about the system, in October 1982, President
Ronald Reagan
Ronald Wilson Reagan ( ; February 6, 1911June 5, 2004) was an American politician, actor, and union leader who served as the 40th president of the United States from 1981 to 1989. He also served as the 33rd governor of California from 1967 ...
announced that 50 of the newly named Peacekeepers would be put into service in existing
LGM-30 Minuteman
The LGM-30 Minuteman is an American land-based intercontinental ballistic missile (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 r ...
silos, a temporary measure until final basing was decided. The first flight test took place in 1983, which included the successful launch of six inert re-entry vehicles, each hitting pre-planned targets. It was the first U.S. ICBM to use a
cold launch system, and it reached
initial operational capability
Initial operating capability or initial operational capability (IOC) is the state achieved when a capability is available in its minimum usefully deployable form. The term is often used in government or military procurement.
The United States D ...
in 1986.
Meanwhile, the United States and the Soviet Union were negotiating the
START II treaty, under which ICBMs were allowed to carry only a single warhead each. Because the Minuteman could carry a single warhead for far less money, the United States agreed to remove the Peacekeeper from their nuclear force in this treaty.
Despite the U.S. withdrawal from the
Anti-Ballistic Missile Treaty
The Anti-Ballistic Missile Treaty (ABM Treaty or ABMT) (1972–2002) was an arms control treaty between the United States and the Soviet Union on the limitation of the anti-ballistic missile (ABM) systems used in defending areas against ballisti ...
and the subsequent Russian withdrawal from the START II on 14 June 2002, the last Peacekeeper missile was deactivated on 19 September 2005. Their advanced
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 ...
warheads were moved to the Minuteman III.
The private launch firm
Orbital Sciences Corporation
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 ...
has developed the
Minotaur IV
Minotaur IV, also known as Peacekeeper SLV and OSP-2 PK is an active expendable launch system derived from the LGM-118 Peacekeeper ICBM. It is operated by Northrop Grumman Innovation Systems, and made its maiden flight on 22 April 2010, carry ...
, a four-stage civilian
expendable launch system
An expendable launch system (or expendable launch vehicle/ELV) is a launch vehicle that can be launched only once, after which its components are either destroyed during reentry or discarded in space. ELVs typically consist of several rocket sta ...
using old Peacekeeper components.
Development and deployment
Minuteman
Deployment of the
Minuteman
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 ...
ICBM began in 1962, during the
Cold War
The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term '' cold war'' is used because the ...
, and proceeded rapidly. Limited accuracy 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 and a small warhead of less than 1
megaton
Megaton may refer to:
* A million tons
* Megaton TNT equivalent, explosive energy equal to 4.184 petajoules
* megatonne, a million tonnes, SI unit of mass
Other uses
* Olivier Megaton (born 1965), French film director, writer and editor
* ''Me ...
meant the system was unable to attack hardened targets like
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. This limited these early models to attacks on strategic targets like cities and ports, and the system had little or no capability as 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 ...
weapon. The Air Force relied on its manned bombers as the primary weapon for attacking hardened targets and saw the ICBM as a survivable deterrent that would guard against an attack on its bomber fleet.
As the
Kennedy administration
John F. Kennedy's tenure as the 35th president of the United States, began with his inauguration on January 20, 1961, and ended with his assassination on November 22, 1963. A Democrat from Massachusetts, he took office following the 1960 p ...
took power, the 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 given the seemingly impossible task of making the US military the most powerful in the world while at the same time reducing its expenditures. He ultimately solved this problem by greatly reducing reliance on the bomber and passing the role to the Minuteman. Over time, improvements to the Soviet missiles, real or imagined, led to US officials proposing a worrying scenario; a Soviet
first strike with a limited number of warheads aimed at the Minuteman control bunkers could cripple the US ICBM fleet. At the time the Soviets were only capable of mounting a limited attack. With the limited accuracy of Soviet missiles, only an attack with a small number of missiles carrying very large warheads (multi-megaton range) was feasible. They had just enough of these to make a damaging, but not decisive, attack on the US ICBM fleet. By April 1964 the US had more ICBMs on active alert than
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, which exacerbated this concern.
The US ICBM fleet was primarily targeted against cities, and retargeting them took considerable time. In the event of a Soviet missile launch, the US faced the difficult decision of whether to fire their own missiles immediately or wait to determine the targets of the Soviet missiles. Firing early might mean striking civilian targets (
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 ...
) when the Soviets had only targeted military installations, something US politicians considered to be a serious problem (part of the
flexible response
Flexible response was a defense strategy implemented by John F. Kennedy in 1961 to address the Kennedy administration's skepticism of Dwight Eisenhower's New Look and its policy of massive retaliation. Flexible response calls for mutual deter ...
doctrine). Conversely, waiting to fire might mean the loss of the ICBM fleet. However, as the
US 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 of ...
was quick to point out, their
Polaris fleet's stealth and mobility would maintain a countervalue force.
This scenario was of deep concern to the United States Air Force. If the role of the nuclear missile was to ride out a first strike and ensure a counterstrike, then the Navy might be handed the mission outright. Looking for a new role, the Air Force began to turn their attention away from the deterrent role toward counterforce. Continued work on the Minuteman led to the Minuteman II specification, set in 1962. The new version included two key improvements. One was the new NS-17
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 ...
, which improved the CEP to , enough to allow it to attack hardened targets. Just as important, the guidance system allowed for the inclusion of eight pre-selected targets. This allowed the force to ride out a Soviet first strike, select the appropriate enemy targets, military or civilian, and launch. Against a limited attack, it offered the US a major strategic advantage. Of course, the Soviets could also improve their own system's CEP and turn all of their missiles into
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 ...
weapons as well. With the ICBM force now critical to the strategic mission, the Air Force became increasingly interested in new ways to keep the missiles safe from such an attack.
Golden Arrow
The Air Force had depended on engineering support from
TRW during the early days of the development of their ICBM force. In 1960 a number of TRW and other engineers involved in the ICBM program formed
The Aerospace Corporation
The Aerospace Corporation is an American nonprofit corporation that operates a federally funded research and development center (FFRDC) in El Segundo, California. The corporation provides technical guidance and advice on all aspects of space mi ...
, initially working on the
Mercury spacecraft
Project Mercury was the first human spaceflight program of the United States, running from 1958 through 1963. An early highlight of the Space Race, its goal was to put a man into Earth orbital spaceflight, orbit and return him safely, ideally ...
,
X-20 Dynasoar
The Boeing X-20 Dyna-Soar ("Dynamic Soarer") was a United States Air Force (USAF) program to develop a spaceplane that could be used for a variety of military missions, including aerial reconnaissance, bombing, space rescue, satellite mainten ...
and various ICBM projects. In 1964, the Air Force contracted them to consider a wide variety of survivable ICBM approaches, under the name "Golden Arrow".
The project considered road, rail, submarine and air-launched weapons. One of these suggested an
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 ...
. The proposal called for an enormous (for the day)
turboprop
A turboprop is a turbine engine that drives an aircraft propeller.
A turboprop consists of an intake, reduction gearbox, compressor, combustor, turbine, and a propelling nozzle. Air enters the intake and is compressed by the compressor. Fuel ...
-powered aircraft with two-day endurance carrying up to eight missiles that would be dropped out the back, parachuted to the vertical, and then launched. As part of the same study, Aerospace also considered a missile and wheeled launcher combination that was small enough that they could be carried in existing
C-141 Starlifter
The Lockheed C-141 Starlifter is a retired military strategic airlifter that served with the Military Air Transport Service (MATS), its successor organization the Military Airlift Command (MAC), and finally the Air Mobility Command (AMC) of the ...
aircraft. During periods of heightened tensions, they would be flown to practically any airport and set up. The Soviets would have to target thousands of airports, runways and even dirt strips and long stretches of highway in order to attack the fleet.
Finally, they also considered conventional missiles in "super hard" silos, buried under the southern side of mountains. As the enemy warheads would approach at a fairly shallow angle from the north, they would strike the north side of the mountains before they could hit the silos themselves. Properly positioned, this would keep the explosions at least away from the silos; it was believed that silos able to withstand multi-megaton explosions at one mile could be built, although this was an area of some uncertainty. This system had the advantage that the basing would be immune to changes in accuracy or speed of the attack, only enormous increases in yield could overcome this physical barrier.
They proposed 100 missiles in three bases of thirty missiles each. They expected that at least one base would be able to survive even an all-out attack. However, if such a force of approximately 30 missiles was going to be a reasonable deterrent, each missile would need to carry 20 or more warheads. To launch them, the study introduced the "ICBM-X", a massive new diameter design, well over twice the diameter of the existing
LGM-30 Minuteman
The LGM-30 Minuteman is an American land-based intercontinental ballistic missile (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 r ...
, and larger even than the
Titan II
The Titan II was an intercontinental ballistic missile (ICBM) developed by the Glenn L. Martin Company from the earlier Titan I missile. Titan II was originally designed and used as an ICBM, but was later adapted as a medium-lift space l ...
"heavy" design at .
Any of the "Golden Arrow" concepts would be extremely expensive, and in the era of
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 ...
's
US Department of Defense
The United States Department of Defense (DoD, USDOD or DOD) is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government directly related to national secu ...
, cost was as important as any other consideration. As
Alain Enthoven put it, "Our gross national product, though large, is limited. If we attempted to develop and procure a dozen or more distinct different nuclear delivery systems… we doubtless would end up squandering our resources and not doing a good job on any of them." Golden Arrow, along with many similar proposals from other firms, proceeded no further, in favor of the Minuteman II.
WS-120A
In 1966 and 67, the Department of Defense ran the
STRAT-X study to consider many of these issues. As part of this program, they proposed a smaller version of ICBM-X with 10 to 20 warheads. Known initially as WS-120A and later as
BGM-75 AICBM
The ZBGM-75 Advanced Intercontinental Ballistic Missile, also known as Weapons System 120A (WS-120A), was a program to develop an intercontinental ballistic missile (ICBM), proposed by the United States Air Force in the 1960s as a replacement fo ...
, the missile was small enough to fit in existing large silos, like those for the
Titan II
The Titan II was an intercontinental ballistic missile (ICBM) developed by the Glenn L. Martin Company from the earlier Titan I missile. Titan II was originally designed and used as an ICBM, but was later adapted as a medium-lift space l ...
, but was otherwise similar in concept to the ICBM-X, 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 , and especially the ability to be quickly re-programmed to attack any targets needed. In comparison, the Minuteman II had a selection of eight targets, any one of which could be quickly selected for attack, but otherwise selecting a target outside this pre-computed list was not something that could be done "on the fly". WS-120A's preferred basing mode was a super hardened shelter, but dispersed mobile options were also considered.
However, like Golden Arrow before it, WS-120A's advantages found themselves being diluted by the new Minuteman III. The Minuteman III used the new NS-20
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 ...
(INS) with a CEP of , three warheads and an expanded collection of radar countermeasures that would ensure the warheads would survive 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 ...
attack. Although the system did not include the ability to be rapidly retargeted, this capability was under development and started deployment in 1972, before the planned 1975 introduction date of WS-120A. When it was fully deployed in 1978, the entire ICBM fleet could be entirely reprogrammed in 10 hours.
INS advances
Since the late 1950s, engineers at the
Charles Stark Draper Laboratory had been working on a new type of
inertial platform that replaced the mechanical
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 ...
s with a sphere floating in a thin layer of fluorocarbon fluid. The so-called "flimbal" (apparently for "FLoated Measurement BAL") would offer unprecedented accuracy and would be free from "
gimbal lock
Gimbal lock is the loss of one degree of freedom in a three-dimensional, three-gimbal mechanism that occurs when the axes of two of the three gimbals are driven into a parallel configuration, "locking" the system into rotation in a degenerate t ...
", a problem that caused conventional platforms to "tumble" and lose their accuracy. Like the ICBM-X, there was little development as there appeared to be no need for a platform with the sort of accuracy the flimbal provided, and the expense of developing the system would be extremely high.
In spite of a lack of official interest, during the late 1960s Kenneth Fertig managed to arrange some funding through the Air Force for the "SABRE" INS project, short for "Self-Aligning Boost and RE-entry". The name referred to the concept that the system would be so accurate and free from the effects of mechanical shocks and jarring that it would not require any other form of "fixing" in flight. This was in contrast to the stellar-inertial systems under development by the Navy and others. It would retain its accuracy even through the rough conditions during re-entry, allowing the creation of maneuvering reentry vehicles.
Counterforce considerations
During the late 1970s, the
Soviet Union
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 national ...
fielded a large number of increasingly accurate
MIRV
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 i ...
ed
Heavy ICBM
Heavy ICBM is a term that was created in the 1970s to describe a class of Soviet and Russian ICBMs (intercontinental ballistic missiles). They were characterized by a heavy throw-weight of 5 to 9 metric tons, several times that of an LGM-30 Minute ...
s like the
SS-18. These missiles carried as many as 10 warheads along with up to 40
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, meaning that a small number of launches could present a threat to the Air Force's ICBM fleet while retaining a large force in reserve. If the Soviet Union launched a
first strike and the US did not respond immediately, the majority of their missiles and strategic bombers might be caught on the ground. A credible deterrent force would remain, but such a force might not have enough warheads left to attack ''both'' the remaining Soviet fleet and cities and other military targets.
In such a situation, the US would be left with two uncomfortable options. If they chose to respond in kind and attack the remaining Soviet missile fleet, there would be little to respond with if the Soviets immediately launched against US cities. The other option would require the US to be the first country to launch an attack on civilian targets, an attack that was both morally reprehensible as well as against stated policy. This worrying scenario led to the effort to develop a new ICBM with the accuracy needed to be an excellent counterforce weapon, the survivability needed to absorb a Soviet first strike, and the MIRV capabilities needed to ensure even a small number of survivors would be able to attack the remaining Soviet missile fleet. The Minuteman III simply did not have this combination of features.
Whether or not this problem actually existed is open to debate. The Minuteman had a relatively fast launch time, and
early warning satellite
An early warning satellite is a satellite designed to rapidly detect ballistic missile launches and thus enable defensive military action. To do this, these satellites use infrared detectors that identify the missile thanks to the heat given off ...
s meant that commanders would have almost instant warning of a Soviet launch, with ample time to plan a response. However, it would not be until much later in the sequence of events that land-based radars would be able to track the incoming individual warheads and determine the targets. In the case of a limited counterforce attack, it would be desirable to wait until the individual targeted silos were determined, determine which Soviet missiles had not been launched, and then launch only the targeted missiles against their unlaunched Soviet counterparts. This would require extremely tight timing.
The development of practical
SLBM
A submarine-launched ballistic missile (SLBM) is a ballistic missile capable of being launched from Ballistic missile submarine, submarines. Modern variants usually deliver multiple independently targetable reentry vehicles (MIRVs), each of whic ...
systems upset the nuclear equation dramatically. These weapons were essentially invulnerable when at sea, and offered a credible countervalue force, primarily against civilian targets as early models like the
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 ...
and
UGM-73 Poseidon
The UGM-73 Poseidon missile was the second US Navy nuclear-armed submarine-launched ballistic missile (SLBM) system, powered by a two-stage solid-fuel rocket. It succeeded the UGM-27 Polaris beginning in 1972, bringing major advances in warhea ...
did not have the accuracy to attack Soviet silos and thus offered little counterforce capability. In some ways this helped the Air Force, as it meant they could concentrate on the counterforce scenarios, knowing that a countervalue attack would always be available from the Navy. However, improvements in SLBM accuracy might allow them to handle counterforce as well, and render the entire land-based ICBM fleet superfluous. The Air Force was not interested in handing the strategic role to the Navy. A survivable ICBM would address this issue.
MX
![Peacekeeper_ICBM_Inertial_Measurement_Unit](https://upload.wikimedia.org/wikipedia/commons/1/12/Peacekeeper_ICBM_Inertial_Measurement_Unit.jpg)
In 1971, the Air Force started a requirements development process combining the ICBM-X and SABRE concepts into a single platform, "Missile, Experimental", or MX. The new missile would have enough accuracy and warhead payload that even a few survivors would be able to destroy enormous numbers of any remaining Soviet force. The specifications for MX were fixed in February 1972, the program office at the
Space and Missile Systems Organization
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 ...
(SAMSO) formed on 4 April, and the advanced development program started in late 1973.
To address the survivability issue, a huge series of concepts and studies followed. In 1973,
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 ...
rejected mobile basing due to high costs and slow reaction times due to the need to set up the launcher. On 24 October 1974 the airmobile concept was tested by SAMSO by dropping a Minuteman I from a C-5A cargo aircraft. In November, the
Secretary of Defense pushed the initial operational date back from 1983 to 1985 and opened a study on the possibility of developing a single missile for both ICBM and SLBM use.
For MX, the Draper Laboratory developed SABRE into the "
Advanced Inertial Reference Sphere
The Advanced Inertial Reference Sphere (AIRS) is a highly accurate inertial guidance system designed for use in the LGM-118A Peacekeeper ICBM which was intended for precision nuclear strikes against Soviet missile silos.
Details
AIRS is a Fluid-su ...
" (AIRS). AIRS would have a drift rate of only 1.5 x 10
−5 degrees per hour, allowing it to be periodically referenced to an external point, like the silo wall, and then left for extended periods of time. Over the period of the flight the drift would be so low that any inaccuracies in the platform would account for a maximum of 1% of the warhead's final accuracy–the rest would be due to issues like the timing of the firing of the rocket engines, minor differences in warhead construction, and unavoidable randomness in the atmosphere. The Air Force also contracted with
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, ...
for a backup design using mechanical gimbals, the "Advanced Stable Platform" (ASP). In May 1975 the first hand-built AIRS was transferred from Draper's laboratory to
Northrop for further development.
Basing options
![Peacekeeper-missile-testing](https://upload.wikimedia.org/wikipedia/commons/5/5f/Peacekeeper-missile-testing.jpg)
In July 1976, Congress refused to fund MX using a silo-based system on grounds of vulnerability, and the project was halted. Several new proposals were made for alternate basing arrangements, including mobile basing in railway cars that would be sent out into the nation's rail network during times of heightened threat levels, and more complex systems of deeply buried silos under
mesa
A mesa is an isolated, flat-topped elevation, ridge or hill, which is bounded from all sides by steep escarpments and stands distinctly above a surrounding plain. Mesas characteristically consist of flat-lying soft sedimentary rocks capped by ...
s that would include systems to quickly dig themselves out after an attack.
Eventually, the program was reinstated on 12 June 1979 by
President Carter
James Earl Carter Jr. (born October 1, 1924) is an American politician who served as the 39th president of the United States from 1977 to 1981. A member of the Democratic Party, he previously served as the 76th governor of Georgia from 19 ...
. On 7 September 1979 he announced that 200 MX missiles would be deployed throughout eastern
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 ...
and western
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 ...
. The deployment would occur in a system of multiple protective shelters linked by underground or aboveground roads, the so-called "Racetrack" proposal. Local opposition in Nevada was intense, and the concept gained a powerful enemy in the form of Senator
Paul Laxalt
Paul may refer to:
*Paul (given name), a given name (includes a list of people with that name)
* Paul (surname), a list of people
People
Christianity
*Paul the Apostle (AD c.5–c.64/65), also known as Saul of Tarsus or Saint Paul, early Chri ...
. Initially support was high in Utah, especially in the
Beaver County area; although opposition increased dramatically following a statement of disapproval by the
leaders
Leadership, both as a research area and as a practical skill, encompasses the ability of an individual, group or organization to "lead", influence or guide other individuals, teams, or entire organizations. The word "leadership" often gets view ...
of
the Church of Jesus Christ of Latter-day Saints
The Church of Jesus Christ of Latter-day Saints, informally known as the LDS Church or Mormon Church, is a Nontrinitarianism, nontrinitarian Christianity, Christian church that considers itself to be the Restorationism, restoration of the ...
.
When
Ronald Reagan
Ronald Wilson Reagan ( ; February 6, 1911June 5, 2004) was an American politician, actor, and union leader who served as the 40th president of the United States from 1981 to 1989. He also served as the 33rd governor of California from 1967 ...
took office, Laxalt's close ties with Reagan proved useful. Reagan canceled the new shelter system in 1981, calling it "a
Rube Goldberg
Reuben Garrett Lucius Goldberg (July 4, 1883 – December 7, 1970), known best as Rube Goldberg, was an American cartoonist, sculptor, author, engineer, and inventor.
Goldberg is best known for his popular cartoons depicting complicated gadge ...
scheme". On 2 October 1981 he proposed deploying an initial force of missiles in the approximately 60 existing
Titan II
The Titan II was an intercontinental ballistic missile (ICBM) developed by the Glenn L. Martin Company from the earlier Titan I missile. Titan II was originally designed and used as an ICBM, but was later adapted as a medium-lift space l ...
silos, removing those now outdated missiles from service. The silos would be modified for much greater strength, and a number of Minuteman III silos similarly adapted over time to bring the force to a total of 100 missiles. Additionally, he suggested funding development of three additional concepts, airborne drops from cargo aircraft, an "active defense" using short-range
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 ...
, or basing new silos deep underground or on the south side of
mesa
A mesa is an isolated, flat-topped elevation, ridge or hill, which is bounded from all sides by steep escarpments and stands distinctly above a surrounding plain. Mesas characteristically consist of flat-lying soft sedimentary rocks capped by ...
s ("reverse-inclination basing"). The latter two quickly proved unacceptable for various reasons, while testing of the air-drop concept was pursued.
On 22 November 1982, Reagan announced that the system would be deployed in new silos in what was then known as "Closely Spaced Basing", but later better known as "
dense pack
Dense Pack is a strategy for basing intercontinental ballistic missiles (ICBMs) for the purpose of maximizing their survivability in case of a surprise nuclear Pre-emptive nuclear strike, first strike on their silos conducted by a hostile foreign p ...
". During this speech, he made the first mention of the name Peacekeeper. The dense pack idea involved building super-hardened silos that would withstand more than of
overpressure, compared to 2,000 of the existing silos, or for the upgraded versions originally proposed.
This extra hardness can be offset by minor increases in warhead accuracy. The key to dense pack concept was to space the silos close together, about . This was far enough apart that a single warhead could not destroy more than one silo; no conceivable warhead was powerful enough to destroy the silos from the point between them, from either silo. To attack the dense pack, separate warheads would have to be aimed at each silo. When one of the attacking warheads exploded, the blast wave and dirt thrown into the air would destroy any nearby warheads.
This "
fratricide
Fratricide (, from the Latin words ' "brother" and the assimilated root of ' "to kill, to cut down") is the act of killing one's own brother.
It can either be done directly or via the use of either a hired or an indoctrinated intermediary (a ...
theory" was highly criticized due to the expected relative ease with which the Soviets could modify their warheads and circumvent this design. All that was required was that several warheads arrive and be detonated within a few milliseconds of each other, so the blast waves did not reach each other before completing destruction of the silo. Such timing could be easily achieved by launching all of the warheads from a single missile. Congress again rejected the system.
Scowcroft Commission
Reagan responded to this setback by appointing Lieutenant General
Brent Scowcroft
Brent Scowcroft (; March 19, 1925August 6, 2020) was a United States Air Force officer who was a two-time United States National Security Advisor, first under U.S. President Gerald Ford and then under George H. W. Bush. He served as Military As ...
to lead a Commission on Strategic Forces, better known as the Scowcroft Commission.
In overall terms, the most important conclusion of the Scowcroft Commission was that the "
window of vulnerability
Vulnerability refers to "the quality or state of being exposed to the possibility of being attacked or harmed, either physically or emotionally."
A window of vulnerability (WOV) is a time frame within which defensive measures are diminished, com ...
" in regard to the Soviet capability to attack US ICBMs never existed in the first place. The report examined a wide array of potential attack scenarios, and demonstrated that none allowed the Soviets to significantly blunt a US response, nor seriously limit its options in the
flexible response
Flexible response was a defense strategy implemented by John F. Kennedy in 1961 to address the Kennedy administration's skepticism of Dwight Eisenhower's New Look and its policy of massive retaliation. Flexible response calls for mutual deter ...
policy.
Delivered 6 April 1983, the report suggested deploying 100 MX in existing Minuteman silos as a "demonstration of national will", but in other ways basically suggested eliminating both MX and Minuteman and replacing them with a small single-warhead mobile ICBM. On 10 August, the Secretary of Defense ordered 100 Peacekeepers be deployed at
Warren AFB in Wyoming and began development of what became the
MGM-134 Midgetman
The MGM-134A Midgetman, also known as the Small Intercontinental Ballistic Missile, was an intercontinental ballistic missile developed by the United States Air Force. The system was mobile and could be set up rapidly, allowing it to move to a ne ...
.
SLBMs come of age
By this time both the US and USSR were beginning to field third-generation SLBMs with greatly improved accuracy. These now arguably had all of the capability of the land-based ICBMs, and were equally able to carry out the counterforce mission.
[ Additionally, the submarines could maneuver much closer to their targets, greatly reducing the warning time, potentially to the point that the command structure would not have time to launch their ICBMs and bombers before the warheads were reaching them.
The development of the ]Trident II
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 ...
, which was described as "effective against most of the hardened military targets, including missile silos and launch control centers",[ reopened the debate about MX. If Trident was capable of carrying out the mission originally intended for MX, and do so from a completely protected and mobile platform, what capabilities did MX add?
A compromise was eventually developed in mid-1983. Under this scheme, 100 missiles would be deployed in existing Minuteman silos to "show national will". The plan also called for the removal of the old and accident-prone liquid fueled Titan II from use. However, this did not address the problem the MX was originally intended to solve, providing high survivability. This would later be addressed through the re-introduction of the "rail garrison" concept, with twenty-five trains each carrying two missiles. This system was expected to be operational in 1992. The supposed counterforce gap, then being widely talked about on television, also resulted in the schedule for silo deployment being moved up, dropping the production time from 44 months to 29.
Additionally, the plan also called for the development of an entirely new missile, which would emerge as the ]MGM-134 Midgetman
The MGM-134A Midgetman, also known as the Small Intercontinental Ballistic Missile, was an intercontinental ballistic missile developed by the United States Air Force. The system was mobile and could be set up rapidly, allowing it to move to a ne ...
. The Midgetman deliberately carried only one warhead and was highly mobile. Countering a single Midgetman would require the Soviets to blanket an area around its last known position with warheads. Even if this was successful, they would destroy only a single warhead. Faced with this choice, it was expected the Soviets would instead expend their warheads on easier targets.
Peacekeeper Rail Garrison
The Peacekeeper Rail Garrison is a mobile missile system that was developed by 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 ...
during the 1980s as part of a plan to place fifty MGM-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 ...
intercontinental ballistic missiles
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 ...
on the rail network of the United States. The railcars were intended, in case of increased threat of nuclear war, to be deployed onto the nation's rail network to avoid being destroyed by a first strike 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 ...
attack by the Soviet Union
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 national ...
. However the plan was cancelled as part of defense cutbacks following the end of the Cold War
The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term '' cold war'' is used because the ...
, and the Peacekeeper missiles were installed in silo launchers as LGM-118s instead.
Deployment
The new ICBM was originally planned to be called "Peacemaker", but at the last minute was officially designated the LGM-118A Peacekeeper. It was first test fired on 17 June 1983, by the Air Force Systems Command Ballistic Missile Office (Norton AFB, CA), 6595th Missile Test Group (Vandenberg AFB, CA Strategic Air Command), and Martin Marietta, from Vandenberg AFB, California Test Pad-01, traveling to strike successfully in the Kwajalein
Kwajalein Atoll (; Marshallese: ) is part of the Republic of the Marshall Islands (RMI). The southernmost and largest island in the atoll is named Kwajalein Island, which its majority English-speaking residents (about 1,000 mostly U.S. civilia ...
Test Range in the Pacific. The first eight test flights were launched from an above ground canister on TP-01, with the remaining test and operational Strategic Air Command flights from silos (LF-02, −05, & -08) all located on North Vandenberg AFB. A total of 50 flight tests were accomplished.
The operational missile was first manufactured in February 1984 and was deployed in December 1986 to 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 ...
, 90th Strategic Missile Wing at the Francis E. Warren Air Force Base
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 ...
in Cheyenne, Wyoming
Cheyenne ( or ) is the capital and most populous city of the U.S. state of Wyoming, as well as the county seat of Laramie County, with 65,132 residents, per the 2020 US Census. It is the principal city of the Cheyenne metropolitan statistical ...
in re-fitted Minuteman silos. However, the AIRS was not yet ready and the missiles were deployed with non-operational guidance units. AIRS had 19,000 parts and some of these required as many as 11,000 testing steps. Bogged down in paperwork due to government procurement policies, managers started bypassing official channels and buying replacement parts wherever they could be found, including claims that some of the parts were sourced at Radio Shack
RadioShack, formerly RadioShack Corporation, is an American retailer founded in 1921.
At its peak in 1999, RadioShack operated over 8,000 worldwide stores named RadioShack or Tandy Electronics in the United States, Mexico, United Kingdom, Austra ...
. In other cases, managers had created false shell companies to order needed test equipment.
When these allegations were released by ''60 Minutes
''60 Minutes'' is an American television news magazine broadcast on the CBS television network. Debuting in 1968, the program was created by Don Hewitt and Bill Leonard, who chose to set it apart from other news programs by using a unique styl ...
'' and the ''Los Angeles Times
The ''Los Angeles Times'' (abbreviated as ''LA Times'') is a daily newspaper that started publishing in Los Angeles in 1881. Based in the LA-adjacent suburb of El Segundo since 2018, it is the sixth-largest newspaper by circulation in the Un ...
'', the fallout was immediate. Northrop was slapped with a $130 million fine for late delivery, and when they reacted against employees they were countersued in whistleblower
A whistleblower (also written as whistle-blower or whistle blower) is a person, often an employee, who reveals information about activity within a private or public organization that is deemed illegal, immoral, illicit, unsafe or fraudulent. Whi ...
suits. The Air Force also admitted that 11 of the 29 missiles deployed were not operational. A Congressional report stated that "Northrop was behind schedule before it even started" and noted that the Air Force knew as early as 1985 that there were "serious system deficiencies as well as a lack of effective progress". They complained that the Air Force should have come clean and simply pushed back the deployment date, but instead, in order to foster the illusion of progress, the missiles were deployed in a non-operational state.
The first prototype AIRS, by then known more generically as the Inertial Measurement Unit, or IMU, was delivered in May 1986, 203 days late. It was not until July 1987 that the first production AIRS were ready to ship, and the complete supply for the first 50 missiles was not complete until December 1988. Given these delays, and increased performance of the UGM-133 Trident II
The UGM-133A Trident II, or Trident D5 is a submarine-launched ballistic missile (SLBM), built by Lockheed Martin Space in Sunnyvale, California, and deployed with the American and British navies. It was first deployed in March 1990, and rema ...
, Congress had already cancelled the 100-missile option in July 1985. In that decision, Congress limited the deployment of Peacekeeper ICBMs to 50 missiles until a more "survivable" basing plan could be developed.
Development of the rail garrison system was carried out in parallel. However, budgetary constraints and the dissolution of the Soviet Union
The dissolution of the Soviet Union, also negatively connoted as rus, Разва́л Сове́тского Сою́за, r=Razvál Sovétskogo Soyúza, ''Ruining of the Soviet Union''. was the process of internal disintegration within the Sov ...
led to its being scrapped. The National Museum of the United States Air Force
The National Museum of the United States Air Force (formerly the United States Air Force Museum) is the official museum of the United States Air Force located at Wright-Patterson Air Force Base, northeast of Dayton, Ohio. The NMUSAF is the ...
has a rail garrison box car on display, and developmental remnants of the program can still be found at Vandenberg Air Force Base Vandenberg may refer to:
* Vandenberg (surname), including a list of people with the name
* USS General Harry Taylor (AP-145), USNS ''General Hoyt S. Vandenberg'' (T-AGM-10), transport ship in the United States Navy, sank as an artificial reef in K ...
.
The project had already cost around $20 billion up to 1998 and produced 114 missiles, at $400 million for each operational missile. The "flyaway" cost of each warhead was estimated at 20 to 70 million dollars.
Retirement and deactivation
The missiles were gradually retired, with 17 withdrawn during 2003, leaving 29 missiles on alert at the beginning of 2004, and only 10 by the beginning of 2005. The last Peacekeeper was removed from alert on 19 September 2005 during the final deactivation ceremony when the 400th Missile Squadron was inactivated as well. During the ceremony an Under-Secretary of the Air Force credited the Peacekeeper with helping to end the Cold War.
The Peacekeeper rockets were converted to the satellite launcher role 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 ...
, as the Minotaur IV (OSP-2), while the warheads were redeployed on the existing Minuteman III
The LGM-30 Minuteman is an American land-based intercontinental ballistic missile (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 re ...
missiles. Parts of the missile Roll Control System (RoCS) were reused during the Ares I-X
Ares I-X was the first-stage prototype and design concept demonstrator of Ares I, a launch system for human spaceflight developed by the National Aeronautics and Space Administration (NASA). Ares I-X was successfully launched on October 28, 200 ...
test for the Constellation program
The Constellation program (abbreviated CxP) was a crewed spaceflight program developed by NASA, the space agency of the United States, from 2005 to 2009. The major goals of the program were "completion of the International Space Station" and a " ...
.
Operator
* 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 ...
was the only operator of the Peacekeeper.
:: 400th Strategic Missile Squadron (later 400th Missile Squadron), 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 ...
(1987–2005). Airborne Missileers operating the Common Airborne Launch Control System onboard 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 ...
aircraft provided a survivable capability to remotely control and launch the Peacekeeper ICBM in the event the underground Launch Control Centers were unable to do so.
* 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 ...
: Will use the Minotaur IV
Minotaur IV, also known as Peacekeeper SLV and OSP-2 PK is an active expendable launch system derived from the LGM-118 Peacekeeper ICBM. It is operated by Northrop Grumman Innovation Systems, and made its maiden flight on 22 April 2010, carry ...
civilian launch platform version.
See also
* List of ICBMs
This is a list of intercontinental ballistic missiles developed by various countries.
Russia
Specific types of Russian ICBMs include:
Active
* R-36M2 Voevoda / SS-18 Satan
*UR-100N 15A30 / SS-19 Stiletto
*RT-2PM Topol / 15Zh58 / SS-25 Sickle
*R ...
* Peace through strength
"Peace through strength" is a phrase that suggests that military power can help preserve peace. It has been used by many leaders from Roman Emperor Hadrian in the second century AD to former US President Ronald Reagan in the 1980s. The concept h ...
References
Notes
Further reading
*
External links
Fact File: Intercontinental Ballistic Missiles
(Wayback Machine
The Wayback Machine is a digital archive of the World Wide Web founded by the Internet Archive, a nonprofit based in San Francisco, California. Created in 1996 and launched to the public in 2001, it allows the user to go "back in time" and see ...
copy)
ICBM Peacekeeper Launch video
{{DEFAULTSORT:Lgm-118
Cold War nuclear missiles of the United States
Intercontinental ballistic missiles of the United States
Railway weapons
Weapons and ammunition introduced in 1986