assigned to Peterson; and the "HQ and HQ Sq" of XXII Bomber Command was assigned 14 October 1944 – 13 February 1945, and by 17 August 1944, 4 bomb wings (313th through 316th) were assigned to the base — the last left on 7 June 1945. The 263rd AAF Base Unit became the Peterson "base operating unit" on 8 March 1945 (transferred to Andrews Field on 17 March 1946). The Army Air Forces Instructor School opened at Peterson Field in April 1945, and the base was one of several that transferred to Continental Air Forces on 16 April 1945. (VIII Bomber Command arrived 17 August 1945). The base was inactivated 31 December 1945 after the 13th Bombardment Wing (17 October) and VIII Bomber Command () departed, and site management by the base operating unit ended on 17 December 1945. In 1946, Peterson's last AAF Base Units were discontinued: 260th AAF Base Unit (Fighter Wing) in January, the 202nd AAF Base Unit (Special) in February, and the 268th AAF Base Unit (Instrument Instructor Unit) in March and the 201st (Headquarters Base Unit) in April (the 72nd Fighter Wing was at the base from "4 January 1946 - 9 April 1946"). The 703rd AAF Base Unit (Hq, 53d AACS Group) moved to Kelly Field in February. Designated surplus on 29 July 1946, "the U.S. Government returned control of the [air]field to the City of Colorado Springs". Many of the base buildings were torn down. In 1946, Tonopah AAF (Nevada, on 1 October), Clovis AAF (New Mexico, 16 October), and Casper AAF (Wyoming, on 15 December) became detached installations of the inactive base for a short period. During planning for the new United States Air Force, Colorado's Arlington Auxiliary Army Airfield became a detached installation of the surplus base (1 January – 1947), and the "468th Construction Co (15th AF)" became the inactive base's operating unit in February 1947. The base with new construction was activated 29 September 1947 – 15 January 1948, then was "surplus" until after the notice in November 1950 to reactivate Air Defense Command. The "23 Photo Sq 19 May 1943-9 August 1948" remained throughout both inactive/surplus periods, and the "4600 Maint & Sup Sq" was established at the surplus base on 1 December 1950). USAF installation The military base at the municipal field reactivated as an off-base installation of Ent Air Force Base on 1 January 1951 and