After the creation of the U.S. Air Force as a separate service in 1947, Army Aviation continued to a degree that warranted a new badge for Army Aviators. The result was the creation of the Army Aviator Badge, which is a modified version of the U.S. Air Force Pilot Badge. It comes in three grades: Basic, Senior (7 years service and 1,000 flight hours), and Master (15 years service and 2,000 flight hours). The Aviator and Senior Aviator Badges were approved on 27 July 1950 and the Master Aviator Badge was approved on 12 February 1957.