was operated by Ent's 4600 Air Base Group. After being assigned to Peterson on 1 March 1952, the 4602d Air Intelligence Service Squadron had subordinate organizations at the "Defense Force Headquarters [on] Hamilton Air Force Base, California, at Kansas City, Missouri, and at Stewart Air Force Base" New York. The 4600th Group became the 4600th Air Base Wing on 8 April 1958 (moved to Peterson on 18 October 1972). The 4600th was replaced by the 46th Aerospace Defense Wing on 1 April 1975. In January 1968, Air Training Command's 3253d Pilot Training Squadron at Peterson Field began light aircraft indoctrination for cadets. These operations moved to the United States Air Force Academy on 21 March 1974. The military base at Peterson Field gained its own base commander on 28 February 1975. Primary installation Designated Peterson Air Force Base on 1 March 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 1 March, 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 1 October 1979 (units transferred included the 47th Comm Sq to AFCS and the 46th Wing and 4602nd Computer Services Sq to SAC). ADCOM HQ offices at the Chidlaw Building became the Aerospace Defense Center at Peterson on 1 December 1979. Peterson's NORAD COC Backup Facility achieved Full Operational Capability on 16 November 1982 from the Cheyenne Mountain Complex which was placed on warm standby. The 1st Space Wing replaced the 46th Aerospace Defense Wing on 1 April 1983. Thereafter the 1st Space Wing transferred host unit responsibility to the 3d Space Support Wing activated on 15 October 1986. Army and other units transferred from the former Ent AFB Federal Building to Peterson Building 2 (renamed the Eberhart-Findley Building in October 2012). On 15 May 1992, the personnel and equipment of both the 1st SW and 3d SSW merged to become the 21st Space Wing. Peterson's Space Analysis Center was at the corner of Academy & Fountain Blvds by 2004 before moving on base to bldg 1470, and in 2004 the Space Operations School used a