DAVIS-MONTHAN AIR FORCE BASE, Ariz. --   A Heritage Flight formation flies over show center during the 2016 Heritage Flight Training Course demonstration at Davis-Monthan Air Force Base, Ariz., March 5, 2016. The Heritage Flight Training Course allows pilots assigned to the three Air Combat Command demonstration teams to practice their demonstrations with the Heritage Flight pilots, displaying a formation of modern and historic aircraft. (U.S. Air Force photo by Senior Airman Diana M. Cossaboom)