The Strategic Air Command (SAC) was both a Major Command (MAJCOM) of the United States Air Force and a "specified command" of the United States Department of Defense. SAC was the operational establishment in charge of America's land-based strategic bomber aircraft and land-based intercontinental ballistic missile (ICBM) strategic nuclear arsenal from 1946 to 1992. SAC also controlled the infrastructure necessary to support the strategic bomber and ICBM operations, such as aerial refueling tanker aircraft to refuel the bombers in flight, strategic reconnaissance aircraft, command post aircraft, and, until 1957, fighter escorts.
Following the fall of the Soviet Union, the Air Force instituted a comprehensive reorganization of its major commands. As part of this reorganization, SAC was disestablished on 1 June 1992. As part of the reorganization, SAC's bomber aircraft, ICBMs, strategic reconnaissance aircraft, and command post aircraft were merged with USAF fighter and other tactical aircraft assets and reassigned to the newly-established Air Combat Command (ACC). This included B-52 and B-1 bomber aircraft assigned to the Air Force Reserve and Air National Guard, respectively.
At the same time, most of SAC's aerial refueling tanker aircraft, including those in the Air Force Reserve and Air National Guard, were reassigned to the new Air Mobility Command (AMC). Tankers based in Europe were reassigned to United States Air Forces in Europe (USAFE), while regular air force tankers in the Pacific, as well as Alaska Air National Guard tankers, were reassigned to Pacific Air Forces (PACAF).
The ICBM force was later transferred from ACC to the Air Force Space Command (AFSPC) on 1 July 1993. Another change in late 2009 and early 2010 resulted in the transfer of the ICBM force from AFSPC and the B-52 and B-2 strategic bomber force from ACC to the newly-established Air Force Global Strike Command (AFGSC), which is a direct descendant of SAC.
Read more about Strategic Air Command: Subordinate Components, Strategic Air Command Insignia
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