High Quality Content by WIKIPEDIA articles! The United States Army Air Corps (USAAC) was the predecessor of the U.S. Army Air Forces (USAAF) from 1926-41, which in turn was the forerunner of today's U.S. Air Force (USAF), established in 1947. Although abolished as an organization in 1941, it existed as a branch subordinate to the USAAF from 1941-47. The Air Corps was created from the Air Service in 1926 largely as a compromise between advocates of a separate air arm and those of the command structure of the United States Army who viewed the aviation arm as an auxiliary branch to support the ground forces.