Senior Airman Ellery Lopez, 7th Aircraft Maintenance Squadron crew chief, waits to signal out a B-1B Lancer assigned to the 7th Bomb Wing, Dyess Air Force Base, Texas during Green Flag 14-6 April 24, 2014, at Nellis Air Force Base, Nev. The Green Flag exercise provides aircrew and maintainers training simulating warfare conditions. (U.S. Air Force photo by Senior Airman Christopher Tam)