U.S. Air Force Senior Airman Ryan Claymore, a crew chief with the 169th Aircraft Maintenance Squadron, South Carolina Air National Guard, checks an F-16 Fighting Falcon aircraft after a training mission as part of Green Flag-West at Nellis Air Force Base, Nev., Nov. 4, 2013. Green Flag-West is a joint U.S. Air Force-U.S. Army unscripted battle exercise designed to train participants for complex air defense scenarios while supporting high-intensity ground operations.