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Continental Air Defense Command (CONAD) was a
Unified Combatant Command A unified combatant command (CCMD), also referred to as a combatant command, is a joint military command of the United States Department of Defense that is composed of units from two or more service branches of the United States Armed Forces, ...
of the
United States 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 sec ...
, tasked with air defense for the Continental United States. It comprised Army, Air Force, and Navy components. It included Army Project Nike missiles (Ajax and Hercules) anti-aircraft defenses and USAF interceptors (manned aircraft and BOMARC missiles). The primary purpose of continental air defense during the CONAD period was to provide sufficient attack warning of a Soviet bomber air raid to ensure
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 ...
could launch a counterattack without being destroyed. CONAD controlled nuclear air defense weapons such as the 10 kiloton W-40 nuclear warhead on the CIM-10B BOMARC. The command was disestablished in 1975, and
Aerospace Defense Command Aerospace Defense Command was a major command of the United States Air Force, responsible for continental air defense. It was activated in 1968 and disbanded in 1980. Its predecessor, Air Defense Command, was established in 1946, briefly ina ...
became the major U.S. component of North American Air Defense Command (NORAD).


Background

As the new U.S. Air Force was being established in 1947, consideration of a joint command for air defense began. After the USAF initiated the development of the " 1954 interceptor" (WS-201) to counter expected Soviet bomber advances, the Army deployed M-33 Fire Control for AA artillery in 1950. A proposal for a joint/unified command for air defense was initiated (and failed) in 1950. The new
Air Defense Command Aerospace Defense Command was a major command of the United States Air Force, responsible for continental air defense. It was activated in 1968 and disbanded in 1980. Its predecessor, Air Defense Command, was established in 1946, briefly inac ...
(ADC) at Ent AFB, and
Army Antiaircraft Command An army (from Old French ''armee'', itself derived from the Latin verb ''armāre'', meaning "to arm", and related to the Latin noun ''arma'', meaning "arms" or "weapons"), ground force or land force is a fighting force that fights primarily on ...
(ARAACOM) staffed in the nearby Antlers Hotel (Colorado) was established in 1951. The same year, the Priority Permanent System began replacing the post-war Lashup Radar Network. A direct telephone line was installed in mid-July 1950 between CONAC headquarters and the
26th Air Division The 26th Air Division (26th AD) is an inactive United States Air Force organization. Its last assignment was with Air Defense Tactical Air Command, assigned to First Air Force, being stationed at March Air Force Base, California. It was inactiv ...
HQ at
Roslyn Air Warning Station Roslyn Air National Guard Station (ADC ID: P-3) is a closed United States Air Force station. It was located in East Hills, New York, on Long Island. It was originally part of Clarence MacKay's Harbor Hill estate. It was closed in 2000. History ...
. This marked "the beginning of the Air Force air raid warning system." When the
Korean War {{Infobox military conflict , conflict = Korean War , partof = the Cold War and the Korean conflict , image = Korean War Montage 2.png , image_size = 300px , caption = Clockwise from top:{ ...
broke out, the USAF established a direct telephone line between the
Air Force Command Post The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. The atmosphere of Earth protects life on Earth by creating pressure allowing for ...
in the Pentagon and the
White House The White House is the official residence and workplace of the president of the United States. It is located at 1600 Pennsylvania Avenue NW in Washington, D.C., and has been the residence of every U.S. president since John Adams in ...
. By 1953, continental air defenses included assets of five organizations, the U.S. ones responsible to the U.S.
Joint Chiefs of Staff The Joint Chiefs of Staff (JCS) is the body of the most senior uniformed leaders within the United States Department of Defense, that advises the president of the United States, the secretary of defense, the Homeland Security Council and the ...
: *ADC's " SAGE radar stations, fighter interceptor squadrons, and the Air Defense Direction Center" *
Army Antiaircraft Command An army (from Old French ''armee'', itself derived from the Latin verb ''armāre'', meaning "to arm", and related to the Latin noun ''arma'', meaning "arms" or "weapons"), ground force or land force is a fighting force that fights primarily on ...
(ARAACOM)'s AAA artillery,
MIM-3 Nike Ajax The United States Army's Nike Ajax was the world's first operational guided surface-to-air missile (SAM), entering service in 1954. Nike Ajax was designed to attack conventional bomber aircraft flying at high subsonic speeds and altitudes above ...
surface-to-air missiles, and the network of fire control centers and target acquisition radars *
Alaskan Air Command Alaskan Air Command (AAC) is an inactive United States Air Force Major Command originally established in 1942 under the United States Army Air Forces. Its mission was to organize and administer the air defense system of Alaska, exercise dire ...
(AAC) with interceptors and radars at North America's northwest * Northeast Air Command (NEAC) of the USAF in northeast Canada and
Thule Air Force Base Thule Air Base (pronounced or , kl, Qaanaaq Mitarfik, da, Thule Lufthavn), or Thule Air Base/Pituffik Airport , is the United States Space Force's northernmost base, and the northernmost installation of the U.S. Armed Forces, located north o ...
, Greenland *
Air Defence Command Air Defence Command was a command (military formation), command of the Royal Canadian Air Force and later the Canadian Armed Forces, active from 1951 to 1975. Originally, post-war plans called for air defence to be the responsibility of reserve, au ...
of the
Royal Canadian Air Force The Royal Canadian Air Force (RCAF; french: Aviation royale canadienne, ARC) is the air and space force of Canada. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". The RCAF is one of three environm ...
with its interceptor aircraft and radars


Debate over operational control

The
United States 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 sec ...
agreed that the USAF would assume operational control of all U.S. air defense weapons during an attack. However, the Army complained the USAF command and control network (e.g., the 1950 Strategic Operational Control System (SOCS) telephone/teletype system was "insufficiently reliable." In response to the "enemy capabilities to inflict massive damage on the continental United States by surprise air attack", the
National Security Council A national security council (NSC) is usually an executive branch governmental body responsible for coordinating policy on national security issues and advising chief executives on matters related to national security. An NSC is often headed by a n ...
formulated President
Dwight Eisenhower Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; ; October 14, 1890 – March 28, 1969) was an American military officer and statesman who served as the 34th president of the United States from 1953 to 1961. During World War I ...
's " The New Look" strategy in 1953-54. To minimize the Soviet threat, the New Look strategy aimed to allow
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 ...
(SAC) bombers "to get into the air not be destroyed on the ground" to make massive retaliation possible. Thus the major purpose of air defense was not actually to shoot down enemy bombers, but merely gain time for SAC to respond.


Planning

By October 16, 1953, the
Chairman of the Joint Chiefs of Staff The chairman of the Joint Chiefs of Staff (CJCS) is the presiding officer of the United States Joint Chiefs of Staff (JCS). The chairman is the highest-ranking and most senior military officer in the United States Armed Forces Chairman: app ...
requested the services' input regarding formation of a joint air defense command, but the USAF Chief of Staff on December 16, 1953 "concluded that no change was needed or advisable". (cited and quoted by Wainstein p. 198-9) Under "political pressures for greater unity and effectiveness in the national air defense system", the Chairman-- a Navy Admiral—disagreed with the USAF and in January 1954 "recommended that the JCS approve in principle the establishment of a joint air defense command": :"In an era when enemy capabilities to inflict massive damage on the continental United States by surprise air attack are rapidly increasing, I consider that there is no doubt whatsoever as to the duty of the Joint Chiefs to establish a suitable "joint" command…. The command will be composed of forces of each of the services and provide for the coordinated accomplishment of functions of each of the services for the air defense of the United States." The command was planned to include:Memorandum from Chairman JCS to Chiefs of Staff, CM-47-54 15 January 1954, Subject: "Command Arrangements for the Air Defense of the United States" (Citation 5 at Wainstein pp. 199,262) *all air forces regularly assigned to the air defense of the United States *land based early warning stations and sea-based forces assigned to contiguous radar coverage; *antiaircraft forces of the Army involved in the permanent air defense of the United States *the exercise of operational control of Army and Marine Corps units "which can temporarily augment the air defense forces in event of emergency." *CINCLANT/CINCPAC and CINCAL/CINCNE responses as needed from their "seaward extensions of the early warning system…and early warning installations in Alaska and the NE Command".


Operational control

The Joint Chiefs directed the establishment of CONAD on August 2, 1954. The
Secretary of Defense A defence minister or minister of defence is a cabinet official position in charge of a ministry of defense, which regulates the armed forces in sovereign states. The role of a defence minister varies considerably from country to country; in so ...
announced the command's formation publicly later in the month to integrate "the air defense capabilities of the three military departments into an air defense system responsible to the control of one military commander" (Wainstein). CONAD was established effective September 1, 1954, primarily to defend the continental United States against air attack. It was also tasked to support U.S. commanders in the Pacific, Atlantic, Caribbean, Alaska, Northeast, and of
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 ...
in their missions to the maximum extent consistent with its primary mission. ADC's commander, General
Benjamin Chidlaw General Benjamin Wiley Chidlaw (December 18, 1900 – February 21, 1977) was an officer in the United States Air Force. He directed the development of the United States' original jet engine and jet aircraft. He joined the United States Army ...
, became the first CINCONAD, and the USAF was designated as the executive agency. From 1954 to 1956, CONAD consisted of the USAF
Air Defense Command Aerospace Defense Command was a major command of the United States Air Force, responsible for continental air defense. It was activated in 1968 and disbanded in 1980. Its predecessor, Air Defense Command, was established in 1946, briefly inac ...
,
Army Antiaircraft Command An army (from Old French ''armee'', itself derived from the Latin verb ''armāre'', meaning "to arm", and related to the Latin noun ''arma'', meaning "arms" or "weapons"), ground force or land force is a fighting force that fights primarily on ...
, and the Naval Forces, Continental Air Defense Command (NAVFORCONAD). The USAF ADC Headquarters was additionally designated as Headquarters CONAD. CONAD's operational control covered: # Direction of the tactical air battle # Control of fighters # Specifying the alert condition # Stationing early warning units # Deploying combat units of the command. ADC's main battle control center was moved out of the former hallway/latrine in the Ent AFB headquarters building and into a new-built blockhouse in 1954. At Ent, offices for both HQ CONAD and a new HQ NAVFORCONAD were prepared in the building with the ADC and ARAACOM HQs. NAVFORCONAD was placed under command of Rear Admiral Albert K. Morehouse. The
Experimental SAGE Subsector The Experimental Semi-Automatic Ground Environment (SAGE) Sector (ESS, Experimental SAGE Subsector until planned Sectors/Subsectors were renamed NORAD Regions, Divisions, and Sectors) was a prototype Cold War Air Defense Sector for developing the ...
received a prototype IBM computer in July 1955. for development of a "national air defense network", A late 1955 CONAD plan for USAF
Semi-Automatic Ground Environment The Semi-Automatic Ground Environment (SAGE) was a system of large computers and associated networking equipment that coordinated data from many radar sites and processed it to produce a single unified image of the airspace over a wide area. SA ...
control of Army Nike missiles caused an interservice dispute but later in 1956 the Secretary of Defense approved CONAD's plan for USAF units at computerized Army nuclear bunkers. The 1959 Missile Master Plan resolved the dispute to have separate
Nike Hercules The Nike Hercules, initially designated SAM-A-25 and later MIM-14, was a surface-to-air missile (SAM) used by U.S. and NATO armed forces for medium- and high-altitude long-range air defense. It was normally armed with the W31 nuclear warhead, bu ...
missile command posts in the bunkers. On February 13, 1956, CINCONAD advocated "an eventual combined organization…of the Air Defense Force of all countries and services in and adjacent to North America." December 1956 planning requested "six prime and 41 gap-tiller radars o belocated in Mexico. By 1956, CONAD had designated 3 "SAC Base Complexes" to be defended: in the Northwestern United States, in a Montana-through-North Dakota area, and the largest in a nearly-triangular "South Central Area" from Minnesota to New Mexico to Northern Florida.


1956 reorganization

On September 4, 1956, the JCS changed the Terms of Reference for CONAD to be "more in line ith..a joint task force" and separated command of the USAF Air Defense Command from CINCONAD. The CONAD staff were separated from the ADC HQ staff on October 1, 1956. The JCS also transferred "the air defense systems in Alaska and the Canadian Northeast" from those unified commands to CONAD. On January 1, 1957, CINCONAD placed the U.S. defenses in a geometric "Canadian Northeast Area" under the operational control of the Canadian
Air Defence Command Air Defence Command was a command (military formation), command of the Royal Canadian Air Force and later the Canadian Armed Forces, active from 1951 to 1975. Originally, post-war plans called for air defence to be the responsibility of reserve, au ...
. In March 1957, CONAD said "that an adequate and timely defense system against the intercontinental ballistic missile was "the most urgent future CONAD requirement." CONAD identified a requirement "for a defense against cruise and ballistic missiles launched from submarines or surface ships" on June 14, 1957 The 1957
Gaither Report ''Deterrence & Survival in the Nuclear Age'', commonly referred to as the Gaither report, is a report submitted in November 1957 to the United States National Security Council and the U.S. president concerning strategy to prepare against the perce ...
identified "little likelihood of SAC's bombers surviving since there was no way to detect an incoming attack until the first CBMwarhead landed". In keeping with these recommendations, the
BMEWS The RCA 474L Ballistic Missile Early Warning System (BMEWS, "474L System", Project 474L) was a United States Air Force Cold War early warning radar, computer, and communications system, for ballistic missile detection. The network of twelve ra ...
General Operational Requirement was issued on November 7, 1957. On 6 September 1957, CONAD advised all appropriate agencies that the North American Air Defense Command (NORAD) was to be established at Ent Air Force Base effective 0001 Zulu 12 September. This would integrate the headquarters of CONAD and RCAF ADC. General
Earle E. Partridge Earle Everard "Pat" Partridge (July 7, 1900 – September 7, 1990) was a four-star general in the United States Air Force and a Command Pilot. Biography Earl Partridge graduated Ashby High School, Ashby, Massachusetts in 1917. Partridge enliste ...
, the CONAD/ADC commander, became Commander-in-Chief of NORAD. At the same time, Canadian officers agreed that the command's primary purpose would be "early warning and defense for SAC's retaliatory forces." The CONAD blockhouse at Ent became a "master station" of the 1958 Alert Network Number 1, (
ARDC The abbreviation ARDC may refer to: *Air Research and Development Command, later renamed the Air Force Systems Command * Amateur Radio Digital Communications, a mode using IP addresses beginning with 44.x *American Racing Drivers Club, a midget car ...
's ADSMO was redesignated as the Air Defense Systems Integration Division on February 24, 1958.)
Ground zero In relation to nuclear explosions and other large bombs, ground zero (also called surface zero) is the point on the Earth's surface closest to a detonation. In the case of an explosion above the ground, ''ground zero'' is the point on the grou ...
footage for CONAD was shot during the
Operation Plowshare Project Plowshare was the overall United States program for the development of techniques to use nuclear explosives for peaceful construction purposes. The program was organized in June 1957 as part of the worldwide Atoms for Peace efforts. As ...
nuclear detonation. When the ICBM threat had sufficiently developed, the June 1959 Continental Air Defense Program reduced the number of Super Combat Centers to 7, then all were cancelled on March 18, 1960. The Canadian nuclear bunker started at CFS North Bay was completed in 1963 with vacuum tube computers.


Space defense

CONAD was assigned "operational command" of the Space Detection and Tracking System (SPADATS) on November 7, 1960. SPADATS included
Project Space Track Project Space Track was a research and development project of the US Air Force, to create a tracking system for all artificial satellites of the Earth and space probes, domestic and foreign. Project Space Track was started at the Air Force Cambri ...
and NAVSPASUR sensors. The "Improved Hercules system" for surface-to-air-missiles was first deployed in 1961, and in 1962 the command manned the alternate US command post (CONAD ALCOP) at Richards-Gebaur AFB. CONAD HQ moved from Ent AFB to the nearby
Colorado Springs Colorado Springs is a home rule municipality in, and the county seat of, El Paso County, Colorado, United States. It is the largest city in El Paso County, with a population of 478,961 at the 2020 United States Census, a 15.02% increase since ...
'
Chidlaw Building The Chidlaw Building is a former United States Air Force facility located in the Knob Hill neighborhood of Colorado Springs, Colorado. The building was close to, but not within, the Ent Air Force Base complex, and was leased by the military for ...
in 1963, where a new NORAD/CONAD "war room" (''Combined'' Operations Center) with Iconorama was used until the under-construction Command Center and Missile Warning Center became operational at Cheyenne Mountain Complex in 1966. NORAD HQ moved to the
Chidlaw Building The Chidlaw Building is a former United States Air Force facility located in the Knob Hill neighborhood of Colorado Springs, Colorado. The building was close to, but not within, the Ent Air Force Base complex, and was leased by the military for ...
on February 15, 1963. The CONAD and NORAD offices were consolidated on March 7, 1963. CONAD agreed to allow the FAA to control military aircraft for "scramble, flight en route to target nemy aircraft and recovery" (handed off to military directors for actual intercept) effective February 1, 1964. By January 12, 1965, CONAD had a "Space Defense Center Implementation Plan" (in 1967 the 1st Aero moved Ent's
Space Defense Center The Space Defense Center (SDC) was a space operation center of the North American Aerospace Defense Command. It was successively housed at two Colorado locations, Ent Air Force Base, followed by Cheyenne Mountain's Group III Space Defense Center ...
operations to Cheyenne Mountain Complex's Group III Space Defense Center.) CONAD continued using the same name with "air defense" after
Aerospace Defense Command Aerospace Defense Command was a major command of the United States Air Force, responsible for continental air defense. It was activated in 1968 and disbanded in 1980. Its predecessor, Air Defense Command, was established in 1946, briefly ina ...
(ADCOM) was designated the new USAF "space" command name in 1968 with most of CONAD's missile warning and space surveillance assets (cf. the 1959
Naval Space Surveillance System The AN/FPS-133 Air Force Space Surveillance System, colloquially known as the Space Fence, was a U.S. government multistatic radar system built to detect orbital objects passing over America. It is a component of the U.S. space surveillanc ...
until transferred to the USAF in 2004).


Aftermath

BOMARC alerts ended in 1972, and the post-Vietnam war drawdown closed most CONUS NIKE missile sites during the 1974 Project Concise. At the very end of the command's existence, the SAFEGUARD ABM system was being deployed. It became operational on October 1, 1975. CONAD was disestablished on June 30, 1975. General Lucius D. Clay Jr., the last commander, remained Commander-in-Chief of NORAD, and
Aerospace Defense Command Aerospace Defense Command was a major command of the United States Air Force, responsible for continental air defense. It was activated in 1968 and disbanded in 1980. Its predecessor, Air Defense Command, was established in 1946, briefly ina ...
personnel manned combined NORAD/ADCOM staff organizations. ADCOM was broken up 1979-80 with interceptors transferring to Air Defense, Tactical Air Command, missile warning stations transferring to SAC (e.g., the new
PAVE PAWS PAVE PAWS ( PAVE Phased Array Warning System) is a complex Cold War early warning radar and computer system developed in 1980 to "detect and characterize a sea-launched ballistic missile attack against the United States". With the first solid-s ...
sites), electronics units transferring to the
Air Force Communications Service The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. The atmosphere of Earth protects life on Earth by creating pressure allowing for ...
(AFCS), and the NORAD/ADCOM "Air Force Element" forming the new
Aerospace Defense Center The Aerospace Defense Center (ADC) was a unit of the United States Air Force. It was under the command of the general that also commanded both North American Aerospace Defense Command and Aerospace Defense Command (ADCOM). The center included the ...
. Remaining ADCOM HQ functions continued as combined NORAD/ADCOM organizations, e.g., "HQ NORAD/ADCOM" J31 subsequently manned the Cheyenne Mountain Space Surveillance Center in the same room as the Missile Warning Center, separated by partitions. In 1982, the Aerospace Defense Center was incorporated into the new Air Force Space Command.


References

{{Reflist , refs= {{Cite book , last=Leonard , first=Barry , title=History of Strategic and Ballistic Missile Defense , volume=I: 1945–1955 , url=http://www.history.army.mil/html/books/bmd/BMDV1.pdf , page=31 {{Cite report , last=McMullen , first=Richard F. , date=15 February 1980 , title=History of Air Defense Weapons 1946–1962 , number=ADC Historical Study No. 14 , publisher=Historical Division, Office of information, HQ Air Defense Command {{Cite NORAD Historical Summary , version=1959b , accessdate=30 April 2013 {{Cite report , last=Schaffel , first=Kenneth , year=1991 , title=Emerging Shield: The Air Force and the Evolution of Continental Air Defense 1945-1960 , url=https://archive.org/details/TheEmergingShield , format=45MB
pdf Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems. ...
, work=General Histories , publisher=
Office of Air Force History An office is a space where an organization's employees perform administrative work in order to support and realize objects and goals of the organization. The word "office" may also denote a position within an organization with specific du ...
, isbn=0-912799-60-9 , access-date=2011-09-26 , quote=President Truman's Executive Order of July 26
947 Year 947 ( CMXLVII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. Events By place Europe * Summer – A Hungarian army led by Grand Prince Taksony campaigns in Italy, heading ...
implementing the statute emphasized the Air Force's responsibility to "provide means for coordination of air defense among the services."84 … The day the war began, the U.S. Air Force Operations Staff set up an emergency command post on the fourth floor of the Pentagon to serve as a reception point for radio messages between Vandenberg and his FEAF commanders during Air Staff after-duty hours. In mid-July 1950, the installation of direct telephone lines between Whitehead's headquarters and the 26th Air Division's headquarters marked the beginning of the Air Force air raid warning system. It became a rudimentary national warning network in August when President Truman had a direct telephone line installed between the Air Force Pentagon post and the White House.2 … June 19, 1959, the Master Air Defense Plan. Key features of the plan included a reduction in BOMARC squadrons, cancellation of plans to upgrade the interceptor force, and a new austere SAGE program. In addition, funds were deleted for gap-filler and frequency-agility radars. … When ADC had moved to Ent Air Force Base in January 1951, COC facilities were located in an office building and consisted of a latrine with the plumbing removed and part of a hallway. A much improved 15,000-square-foot concrete block COC became operational on Ent in May 1954." , url-access=registration NOTE: Schaffel's history uses the same name as "The Emerging Shield: The Air Defense Ground Environment," Air University Quarterly Review 8, no. 2 (spring 1956).
{{Cite report , last1=Wainstein , first1=L. (Project Leader) , date=June 1975, number=Study S-467 , publisher=
Institute for Defense Analyses The Institute for Defense Analyses (IDA) is an American non-profit corporation that administers three federally funded research and development centers (FFRDCs) – the Systems and Analyses Center (SAC), the Science and Technology Policy Institute ...
, title=The Evolution of U.S. Strategic Command and Control and Warning, 1945-1972 , quote=After seven years of consideration, the JCS authorized the creation of a joint command to control air defense, directing in August 1954 the establishment at Colorado Springs of the jointly manned Continental Air Defense Command, under the USAF as executive agent.46 … In strategic air defense, the SAGE system of internetted, semiautomatic centers for warning, communications, and antiaircraft action was coming into full operation, and a new, modernized NORAD combat operations center was under construction.3 … the 1958 reorganization of the unified command structure, including the switch from the service "executive agent" system of command to the direct channel from the President and the Secretary of Defense through the JCS for operational direction of the forces.
1954 establishments in the United States 1975 disestablishments in Colorado Military units and formations in Colorado Unified combatant commands of the U.S. Department of Defense Air defence commands of the United States Military units and formations disestablished in 1975