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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，来自路易斯安那州巴克斯代尔空军基地第20轰炸机中队的 B-52H“同温层堡垒”轰炸机起飞执行演习任务。(A B-52 Stratofortress assigned to 20th Bomb Squadron, Barksdale Air Force Base, La., takes off during a Red Flag exercise at Nellis Air Force Base, Nev., Jan. 30, 2013. The B-52 is a long-range, strategic heavy bomber capable of dropping or launching a wide array of munitions, which has been part of the U.S. arsenal for more than 60 years.)

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