High Quality Content by WIKIPEDIA articles! 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. In addition to the training of officers in more than 20 areas of military education, the school became the doctrine development center of the Air Corps, and a preparatory school for Air Corps officers aspiring to attendance at the U.S. Army's Command and General Staff College. The motto of the Air Corps Tactical School was Proficimus More Irretenti "We Make Progress Unhindered by Custom." The Air Corps Tactical School was notable as the birthplace of the Army Air Forces doctrine of daylight precision bombing.