Airmen, assigned to the 366th Fighter Wing, perform diagnostic checks on an F-15E Strike Eagle at Mountain Home Air Force Base, Idaho, Dec. 3, 2016. Their particular F-15E was gearing up to deploy to the annual Checkered Flag exercise hosted by Tyndall AFB. Checkered Flag is a large-force exercise that gives a large number of legacy and fifth-generation aircraft the chance to practice combat training together in a simulated deployed environment.(U.S. Air Force photo by Senior Airman Connor Marth/Released)