Designated Peterson Air Force Base on March 1, 1975, when Ent AFB was being closed, Peterson was the last of the April 1945 Continental Air Forces airbases to be named an air force base. Also on March 1, Peterson assumed several functions from Ent AFB, which became the "Ent Annex" of Peterson, 18 July 1975 – 7 February 1978 (Peterson's off-base "Temporary Military Facility" was opened for space training by 1986). During the first part of the reorganization that broke up ADCOM, the base "transferred to the Strategic Air Command" on October 1, 1979 (units transferred included the 47th Comm Sq to AFCS and the 46th Wing & 4602nd Computer Services Sq to SAC). ADCOM HQ offices at the Chidlaw Building became the Aerospace Defense Center at Peterson on December 1, 1979.