Green Flag-West 11-9
U.S. Air Force Capt. Matt Hendrickson, 171st Air Refueling Squadron pilot, Air National Guard, Selfridge, Mich., conducts pre-launch checks for a KC-135 Stratotanker before a training mission during Green Flag-West 11-9 Aug. 16, 2011, at Nellis Air Force Base, Nev. Green Flag-West provides a realistic close-air support training environment for forces preparing to support worldwide combat operations.(U.S. Air Force photo by Staff Sgt. Christopher Hubenthal/Released)