Torrejón Air Base opened officially on 1 June 1957 with SAC activating the 3970th Strategic Wing on 1 July 1957. The base hosting Sixteenth Air Force as well as SAC"s 65th Air Division (Defense) where it cooperated with Spanish Air Force units in the Air Defense Direction Centers (ADDCs). The 65th Air Division directed base construction, and the establishment of off-base housing and radar sites. The division"s fighter squadrons flew air defense interceptions over Spanish airspace.With the phaseout of the B-47 from SAC in the mid-1960s, the need for SAC European bases diminished. The Sixteenth Air Force was turned over to United States Air Forces Europe (USAFE) on 15 April 1966 and the strategic focus changed to tactical. Prior to 1966, Torrejón AB hosted TDY squadrons of tactical aircraft rotating from CONUS TAC bases which would perform 30-day rotations to Aviano Air Base Italy and Incirlik Air Base, Turkey.