U.S. Air Force crew chiefs from the 140th Maintenance Squadron, Colorado Air National Guard, wait for the signal to launch their F-16 Fighting Falcon fighter jet from the 120th Fighter Squadron at Buckley Air Force Base, Colo., before a training mission at Red Flag 14-1, at Nellis Air Force Base, Nev., Feb. 03, 2014. Combat units come together from the United States and its allied countries to engage in realistic combat training scenarios within Nellis’ 2.9 million acre Test and Training Range Complex. (U.S. Air National Guard photo/Tech. Sgt. Wolfram M. Stumpf)