An Air Force F-35 Lightning II, F-16 Fighting Falcon, F-22 Raptor, A-10C Thunderbolt II and P-51 Mustang fly in formation during the 2018 Heritage Flight Training and certification course at Davis-Monthan Air Force Base, Ariz., March 4, 2018. The aircrews practiced ground and flight training to enable civilian pilots of historic military aircraft and Air Force pilots of current fighter aircraft to fly safely in formations together. Air Force photo by Airman 1st Class Michael X. Beyer