With the end of World War II, the base again became Albuquerque Army Air Field and was used by the Reconstruction Finance Corporation—later called the War Assets Administration. Old or surplus aircraft were to be sold or demolished at the site. Albuquerque Army Air Field received some 2,250 old or surplus aircraft, such as obsolete B-24 Liberator and B-17 Flying Fortress bombers, and smaller aircraft like AT-6 Texan trainers, Curtiss P-40 Warhawk and Bell P-39 Airacobra fighters. Aircraft that the Civil Aeronautics Administration licensed for public use were sold to the public, with prices ranging from $100 for a PT-17 Stearman to $90,000 for a C-54 Skymaster. North American Aviation bought back a large number of their AT-6s, overhauled and resold them to customers including the Dutch and Chinese governments. The remaining 1,151 aircraft were put up for bid in the fall of 1946. The Denver contracting firm that successfully bid on the surplus planes sold some of the engines for commercial air transports, but by the end of the year, the remaining surplus planes were "chopped into sections and melted into ingots in a constantly burning smelter". This storage and recycling effort was the last of Albuquerque Army Air Field's wartime contributions. Cold War Kirtland AAB was put on a temporary inactive basis on 31 December 1945. When World War II ended, it was not clear whether Kirtland Field would be closed or become a permanent USAF facility. The transformation of the Air Depot Training Station into Sandia Base, home to Sandia Laboratory and the AFSWP, kept the facility open and ultimately determined its fate. Kirtland Field was renamed Kirtland AFB, and it became the USAF's main facility for integrating new weapons designs produced by Sandia Laboratory with operational USAF aircraft and equipment. Atomic weapons development On 1 February 1946, Kirtland was transferred to the Fourth Air Force for use as a flight test center. Kirtland Field was returning to B-29 Superfortress activity as the flight-testing headquarters for the 58th Bombardment Wing, which had been stationed at Roswell Army Airfield, New Mexico under the Fourth Air Force. This B-29 unit would assist the Z Division at Sandia Base with flight-testing new atomic weapons designs. The 428th AAF Base Unit (Flight Test) was activated as a unit of the 58th Bombardment Wing and the host of Kirtland Field on 1 February 1946. At that time, there were fewer than 300