Originally, the song was titled “Army Air Corps.” Robert MacArthur Crawford wrote the initial first verse and the basic melody line in May 1939. During World War II, the service was renamed “Army Air Forces” due to the change of the main American army’s air arm naming in mid-1941, and the song title changed to agree. In 1947, when the Air Force became a separate service, the song was retitled, “The U.S. Air Force.”Also known as “Off we go into the wild blue yonder”.