Strategic Air Command (SAC) was 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 components of the United States military's strategic nuclear forces from 1946 to 1992. SAC was also responsible for the operation of strategic reconnaissance aircraft and airborne command post aircraft as well as most of the USAF's aerial refueling fleet, including aircraft from the Air Force Reserve (AFRES) and Air National Guard (ANG). SAC primarily consisted of the Second Air Force (2AF), Eighth Air Force (8AF) and the Fifteenth Air Force (15AF), while SAC headquarters (HQ SAC) included Directorates for Operations & Plans, Intelligence, Command & Control, Maintenance, Training, Communications, and Personnel. At a lower echelon, SAC headquarters divisions included Aircraft Engineering, Missile Concept, and Strategic Communications. In 1992, as part of an overall post-Cold War reorganization of the U.S. Air Force, SAC was disestablished as both a Specified Command and as a MAJCOM, and its personnel and equipment redistributed among the Air Combat Command (ACC), Air Mobility Command (AMC), Pacific Air Forces (PACAF), United States Air Forces in Europe (USAFE), and Air Education and Training Command (AETC), while SAC's central headquarters complex at Offutt AFB, Nebraska was concurrently transferred to the newly created United States Strategic Command (USSTRATCOM), which was established as a joint Unified Combatant Command to replace SAC's Specified Command role. In 2009, SAC's previous USAF MAJCOM role was reactivated and redesignated as the Air Force Global Strike Command (AFGSC), with AFGSC eventually acquiring claimancy and control of all USAF bomber aircraft and the USAF strategic ICBM force. Background The Strategic Air Forces of the United States during World War II included General Carl Spaatz's European command, United States Strategic Air Forces in Europe (USSTAF), consisting of the 8AF and 15AF, and the United States Strategic Air Forces in the Pacific (USASTAF) and its Twentieth Air Force (20AF). The U.S. Army Air Forces' first mission in the Strategic Bombing Campaign in the European Theater during World War II included the VIII Bomber Command, which conducted the first European "heavy bomber" attack by the USAAF on 17 August 1942; the Ninth Air Force, which conducted the first Operation Crossbow "No-Ball" missions on 5 December 1943; the Twelfth Air Force; and the Fifteenth Air Force, which executed bombing operations on 2 November 1943 during Operation