The missile silos became operational on 10 October 1962, but the activation would be short-lived. By April 1965, the Atlas missile was outdated and was phased out of the national strategic defense plan. In August 1966, the 4th Mobile Communications Group transferred from Hunter AFB, Georgia, to Altus. The unit's mission consisted of providing mobile and transportable communication services, aiding navigation and air traffic control throughout the world. In 1967, the Air Force began searching for a base that could handle the training for its strategic airlift fleet, the C-141 Starlifter and its newest and largest transport aircraft, the C-5 Galaxy. Again, Oklahoma proved to be well suited for the mission. The Military Airlift Command (MAC) assumed command of the base from SAC and activated the 443d Military Airlift Wing (443 MAW), Training, to assume host wing responsibilities and to fly alongside the SAC aircraft that would become a tenant command at Altus. By the start of the 1970s, Altus AFB had three aircraft type/models assigned: KC-135s, C-141s, and C-5s. For the KC-135 aircraft at Altus still under SAC's control, the USAF activated the 340th Air Refueling Wing, which continued to operate the base's KC-135s. Modern era The post Cold War environment brought many changes to Altus AFB. On 1 June 1992, the Air Force reorganized and the Military Airlift Command (MAC) disestablished. In its place the new Air Mobility Command (AMC) was activated, which placed MAC's strategic and tactical airlift aircraft and SAC's aerial refueling aircraft under a single command. Second, the 443d Airlift Wing and the 340th Air Refueling Wing were inactivated, with the latter's aircraft transferred to the 19th Air Refueling Wing (19 ARW) at Robins AFB, Georgia. On 1 October, the first Air Mobility Wing (AMW), the 97th Air Mobility Wing (97 AMW), arrived at Altus without personnel or equipment, having formerly been designated as SAC's 97th Bombardment Wing and having been transferred from the deactivating Eaker AFB, Arkansas as a result of Base Realignment and Closure (BRAC) action. The 97 AMW was tasked with flight crew formal training unit (FTU) responsibilities for the C-141 and C-5 aircrew, and with the closure of Castle AFB, California due to BRAC action, concurrently assumed FTU responsibilities for KC-135E/R/T flight crews. On 1 July 1993, the 97th was transferred from AMC to the newly established Air Education and Training Command (AETC) as part of a USAF initiative to move