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美国内华达州内利斯空军基地，红旗 13-2 联合空战演习，路易斯安那州巴克斯代尔空军基地第96轰炸机中队的 B-52H“同温层堡垒”轰炸机正在启动引擎。(Airmen from the 20th Aircraft Maintenance Unit prepare to launch a B-52H Stratofortress, Jan. 31, 2013 at Nellis Air Force Base, Nev. The Barksdale Air Force Base, La., team is at Nellis to participate in Red Flag, a two-week, multinational advanced aerial combat training exercise.)

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