The Army Air Forces Tactical Center was a major command and military training organization of the United States Army Air Forces during World War II. It trained cadres from newly formed units in combat operations under simulated field conditions around which new combat groups would be formed. It was established as the Army Air Forces School of Applied Tactics (AAFSAT) in 1942 and redesignated the following year. In addition to its training function, the school also developed as a tactical doctrine development center, assuming the functions formerly assigned the Air Corps Tactical School. In June 1946, the center became the Army Air Forces Proving Ground Command. History Background As the threat of entry of the United States into World War II increased, the United States Army decided to close the Air Corps Tactical School in 1940 in order to use its experienced personnel at headquarters, and in expanded training and tactical units. As a result, the responsibility for the development and change to tactics for Air Corps units was scattered among various Air Corps units. Moreover, no single element of the Air Staff or special committee was responsible for overseeing tactical doctrine for the Army's air elements. The field organizations primarily responsible for development of tactics and associated doctrine were the Army Air Force Board, the Air Defense Board, the Fighter Command School and the Army Air Forces Proving Ground. In addition, the splitting of existing combat groups into cadres for new groups had become impracticable as the number of new groups increased. At the entry of the United States into World War II on 7 December 1941, the Army Air Forces (AAF) had expanded to 67 groups from a pre-1939 total of 15, but approximately half were paper units just forming. The entry into the war meant an immediate significant increase in the numbers of new combat groups, expanding to 269 groups by the end of 1943. Formation of the Army Air Forces School of Applied Tactics Headquarters USAAF originally intended that four tactical schools be developed across the United States, one each for air defense, air service, air support and bombardment. However "to save administrative costs and physical outlay" and to facilitate coordination between the schools, all four would be consolidated at a single location. Orlando Army Air Base, Florida was chosen 1 November 1942, primarily because it was already the location of Fighter Command School, which would