in the
Cheyenne Mountain nuclear bunker is the main entrance to another blast door in the background, beyond which the side tunnel branches into access tunnels to the main chambers. The North American Air Defense Command was recommended by the Joint Canadian–U.S. Military Group in late 1956, approved by the U.S.
Joint Chiefs of Staff in February 1957, and announced in August 1957. NORAD's command headquarters was established on 12 September 1957 at
Ent Air Force Base's 1954 blockhouse. In 1958, Canada and the United States agreed that the NORAD commander would always be a United States officer, with a Canadian vice commander. Canada "agreed the command's primary purpose would be ... early warning and defense for the
Strategic Air Command's (SAC)'s retaliatory forces". In late 1958, Canada and the United States started the
Continental Air Defense Integration North (CADIN) for the
Semi-Automatic Ground Environment air defense network. The initial CADIN cost-sharing agreement between the two countries was signed in January 1959. Two December 1958 plans submitted by NORAD had "average yearly expenditure of around five and one half billions", including "cost of the accelerated Nike Zeus program" and three
Ballistic Missile Early Warning System (BMEWS) sites. Canada's NORAD bunker at
CFB North Bay with a SAGE
AN/FSQ-7 Combat Direction Central computer was constructed from 1959 to 1963. Each of the USAF's eight smaller
AN/FSQ-8 Combat Control Central systems provided NORAD with data and could command the entire United States air defense. The RCAF's 1950 "ground observer system, the
Long Range Air Raid Warning System", was discontinued. In January 1959, the United States
Ground Observer Corps was deactivated. The Cheyenne Mountain nuclear bunker's planned mission was expanded in August 1960 to "a hardened center from which CINCNORAD would supervise and direct operations
against space attack as well as air attack". In October 1960, the Secretary of Defense assigned, "operational command of all space surveillance to
Continental Air Defense Command (CONAD) and operational control to North American Air Defense Command (NORAD)". In December 1960, the
Joint Chiefs of Staff (JCS) placed the Ent Air Force Base
Space Detection and Tracking System (496L System with
Philco 2000 Model 212 computer) "under the operational control of CINCNORAD ", during the Cheyenne Mountain nuclear bunker excavation, and the joint SAC-NORAD exercise "
Sky Shield II". In September 1962—"Sky Shield III" were conducted for mock penetration of NORAD sectors. In 1963, NORAD command center operations moved from Ent Air Force Base to the partially underground "Combined Operations Center" for
Aerospace Defense Command and NORAD at the
Chidlaw Building. President
John F. Kennedy visited "NORAD headquarters" after the 5 June 1963
United States Air Force Academy graduation. On 30 October 1964, "NORAD began manning" the Combat Operations Center in the
Cheyenne Mountain Complex. In 1965, about 250,000 United States and Canadian personnel were involved in the operation of NORAD. On 1 January 1966,
Air Force Systems Command turned the COC over to NORAD. The NORAD Cheyenne Mountain Complex was accepted on 8 February 1966.
1968 reorganization United States Department of Defense realignments for the NORAD command organization began on 15 November 1968 (e.g.,
Army Air Defense Command (ARADCOM)). By 1972, there were eight NORAD "regional areas ... for all air defense". The NORAD Cheyenne Mountain Complex Improvements Program (427M System) became operational in 1979.
False alarms On at least three occasions, NORAD systems failed, such as on 9 November 1979, when a technician in NORAD loaded a test tape, but failed to switch the system status to "test", causing a stream of constant false warnings to spread to two "
continuity of government" bunkers as well as command posts worldwide. On 3 June 1980, and again on 6 June 1980, a
computer communications device failure caused warning messages to sporadically flash in U.S. Air Force command posts around the world that a
nuclear attack was taking place. During these incidents,
Pacific Air Forces (PACAF) properly had their planes loaded with nuclear bombs in the air.
Strategic Air Command (SAC) did not and received criticism, because they did not follow procedure, even though the SAC command knew these were almost certainly
false alarms, as did PACAF. Both command posts had recently begun receiving and processing direct reports from the various radar, satellite, and other missile attack detection systems, and those direct reports simply did not match the erroneous data received from NORAD.
1980 reorganization as envisioned by Canada and the US in 1987 Following the 1979 Joint US-Canada Air Defense Study, the command structure for aerospace defense was changed, e.g., "SAC assumed control of
ballistic missile warning and space surveillance facilities" on 1 December 1979 from ADCOM. The Aerospace Defense Command major command ended 31 March 1980. Its organizations in Cheyenne Mountain became the "ADCOM"
specified command under the same commander as NORAD, e.g., HQ NORAD/ADCOM J31 staffed the Space Surveillance Center. In 1982, a NORAD Off-site Test Facility called the Test and Development Facility (TDF) was located at Peterson AFB. The
DEW Line was to be replaced with the
North Warning System (NWS), the
Over-the-Horizon Backscatter (OTH-B) radar was to be deployed, more advanced fighters were deployed, and E-3 Sentry
AWACS aircraft were planned for greater use. These recommendations were accepted by the governments in 1985. The United States Space Command was formed in September 1985 as an adjunct, but not a component of NORAD. NORAD was renamed
North American Aerospace Defense Command in March 1981.
Post–Cold War In 1989, NORAD operations expanded to cover counter-drug operations, for example, tracking of small aircraft entering and operating within the United States and Canada. DEW line sites were replaced between 1986 and 1995 by the North Warning System. The Cheyenne Mountain site was upgraded. After the
September 11 2001 attacks, the NORAD Air Warning Center's mission included the interior airspace of North America. The Cheyenne Mountain Realignment was announced in July 2006, to consolidate NORAD's day-to-day operations at
Peterson Air Force Base. In January 2026, U.S. Ambassador to Canada
Pete Hoekstra warned that PM
Mark Carney’s decision to scale back or cancel Canada's planned purchase of 88 F-35 fighter jets would require changes to the NORAD agreement, with the United States likely sending its aircraft into Canadian airspace if the detail didn't go through. ==In popular culture==