An F-16 Viper taxies after flying during the 2017 Heritage Flight Training and Certification Course at Davis-Monthan Air Force Base, Ariz., Feb. 11, 2017. The F-16 Viper was joined by several aircraft, including the F-22 Raptor, F-35 Lightning II and the A-10C Thunderbolt II during the 20th annual demonstration training. (U.S. Air Force Photo by Senior Airman Kimberly Nagle)