| abstract | - The 1st Strategic Aerospace Division (1st SAD) is an inactive United States Air Force organization. Its last assignment was with Strategic Air Command, assigned to Fifteenth Air Force, being stationed at Vandenberg Air Force Base, California. It was inactivated on 1 September 1991. The division directed and supervised heavy bombardment (1943–1945) and fighter (1944–1945) operations during World War II in the European Theater. Replacing the Eighth Air Force in Okinawa in June 1946, the division directed fighter reconnaissance and bomber organizations, and provided air defense for the Ryukyu Islands, Japan until December 1948. From 1954 to 1955, the division served as a holding unit at Westover Air Force Base, Massachusetts, for personnel of Eighth Air Force, who moved to the base as part of a transfer of Eighth's headquarters from Carswell Air Force Base, Texas. Activated again under the Air Research and Development Command in April 1957, it was the first division level organization controlling intermediate range and intercontinental ballistic missiles. It became an operational component of Strategic Air Command (SAC) in January 1958 and began operational testing of missile systems, supporting missile launchings by SAC and other agencies, and training SAC missilemen. These missions continued until the final disbandment on 1 September 1991.
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