Army Air Base. The antisubmarine mission ended on 6 June and construction crews moved back to the base for a major upgrading project that lengthened the main runway to 7,000 feet. During the construction period and continuing into June 1944, Dover AAB became a sub-base of Camp Springs Army Airfield, Maryland. Full operational capability was restored to Dover in September, and seven P-47 Thunderbolt squadrons arrived for training in preparation for eventual involvement in the European Theater. The 83d Fighter Group was assigned to Dover as the Operational Training Unit. The 83d was redesignated the 125th Base Unit on 10 April 1944 with little change in its mission. It was further redesignated as the 125th Army Air Force base Unit on 15 September 1944. In 1944 the Air Technical Service Command chose Dover as a site to engineer, develop, and conduct classified air-launched rocket tests. The information collected during these experiments resulted in the effective deployment of air-to-surface rockets in both the European and Pacific combat theaters. On 1 September 1946 as a result of the drawdown of United States forces after the war, Dover Army Airfield, was placed on temporary inactive status. A small housekeeping unit, the 4404th Base Standby Squadron, remained on the airfield for care and maintenance of the facility. Cold War and Vietnam Dover Airfield was reactivated on 1 August 1950 as a result of the Korean War and the expansion of the USAF in response to the Soviet threat in the Cold War. On February 1, 1951, the 148th Fighter Interceptor Squadron of the Pennsylvania Air National Guard arrived with P-51 Mustang fighter aircraft. During the 1950s problems developed with many of the facilities in Dover, which had been hastily constructed to support its World War II mission. As a result, a massive Civil Engineering project was undertaken to modernize the base. On April 1, 1952, Dover was transferred to the Military Air Transport Service (MATS) and became home to 1607th Air Transport Wing (Heavy). A full function hospital was completed in 1958 and base housing was expanded to handle 1,200 families in 1961. On January 1, 1966, the Military Air Transport Service was redesignated the Military Airlift Command (MAC). Along with the reorganization, the 1607th was discontinued and the 436th Military Airlift Wing (436 MAW) activated and assumed the mission at Dover. The 436 MAW started replacing C-141 Starlifters and C-133 Cargomasters with the