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红旗 15-2 联合空战演习中，美国空军一架 B-1B 轰炸机在内利斯空军基地维护。（Two crew chiefs assigned to the 28th Aircraft Maintenance Squadron, Ellsworth Air Force Base, S.D., prep a B-1B Lancer for flight during Red Flag 15-2 at Nellis AFB, Nev., March 10, 2015. Red Flag is a realistic combat exercise involving U.S. and allied air forces conducting training operations on the 15,000 square mile Nevada Test and Training Range.）

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