U.S. Air Force Chief of Staff Gen. David L. Goldfein, General Hawk Carlisle, former commander, Air Combat Command, and Gen. James M. Holmes, Commander, ACC, salute during ACC’s Change of Command ceremony at Joint Base Langley-Eustis, Va., March 10, 2017. Holmes assumed command from Carlisle, who retired after 39 years of service to the Air Force. (U.S. Air Force photo by Staff Sgt. Nick Wilson)