The 13th Strategic Missile Division is an inactive United States Air Force unit. Its last assignment was with Fifteenth Air Force, based at Francis E. Warren Air Force Base, Wyoming. It was inactivated on 2 July 1966. Initially formed in 1940 as an air defense formation in the Caribbean, it later commanded Boeing B-17 Flying Fortress groups of Eighth Air Force in the United Kingdom. Its units carried out strategic bombardment missions over Occupied Europe and Nazi Germany. During the Cold War, the division controlling early ICBM wings of Strategic Air Command in the Midwest.