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美国内华达州内利斯空军基地，红旗 14-1 联合空战演习中，美国空军第92空中加油联队一架 KC-135E 空中加油机正在起飞。(A KC-135 Stratotanker assigned to the 92nd Air Refueling Wing at Fairchild Air Force Base, Wash., takes off during Red Flag 14-1 Jan. 28, 2014, at Nellis Air Force Base, Nev. Red Flag is hosted by the 414th Combat Training Squadron. In a typical Red Flag exercise, friendly blue forces engage hostile red forces in realistic combat situations in air, space and cyberspace.)