An F-16 Fighting Falcon from Eielson Air Force Base, Alaska, takes off from Tyndall AFB, Fla., Dec. 10, 2015, during Checkered Flag 16-1. Checkered Flag is a large-force exercise that simulates employment of a large number of aircraft from a simulated deployed environment. (U.S. Air Force photo/Senior Airman Sergio A. Gamboa)