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美国内华达州内利斯空军基地，红旗 13-3 联合空战演习中，美国空军三架 KC-135 空中加油准备出动。(Three U.S. Air Force KC-135 Stratotankers prepare to depart for a training mission during Red Flag 13-3, Feb. 25, 2013, at Nellis Air Force Base, Nev. The KC-135 is a refueling aircraft utilized to extend the range and endurance of U.S. tactical fighters and bombers.)