The Air Corps Tactical School, also known as ACTS and "the Tactical School", was a military professional development school for officers of the United States Army Air Service and United States Army Air Corps, the first such school in the world. Created in 1920 at Langley Field, Virginia, it relocated to Maxwell Field, Alabama, in July 1931. Instruction at the school was suspended in 1940, anticipating the entry of the United States into World War II, and the school was dissolved shortly after. ACTS was replaced in November 1942 by the Army Air Force School of Applied Tactics.