The 3973d Strategic Wing (3973d SW) is an inactive United States Air Force unit, discontinued at Moron Air Base, Spain in 1966. It was established in 1957 to support forward deployed elements of Strategic Air Command (SAC) (REFLEX) and added support of Boeing B-52 Stratofortress CHROME DOME missions, which continued after REFLEX operations ended. It was discontinued when its parent Sixteenth Air Force was transferred to United States Air Forces Europe (USAFE) after the CHROME DOME mission ended in Spain.