ImagesMilitary Environmental impact study A U.S. Air Force A-10 Thunderbolt II with the U.S. Air Force Weapons School, Nellis Air Force Base, Nev., drops a AGM-65 Maverick missile during a close air support training mission Sept. 23, 2011, over the Nevada Test and Training Range. U.S. Air Force Weapons School students participate in many combat training missions over the NTTR during the six-month, graduate-level instructor course held at Nellis Air Force Base, Nev. (U.S. Air Force photo by Senior Airman Brett Clashman/Released) January 28, 2013 Chris Carter A-10 Thunderbolt II, U.S. Air Force