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红旗 15-4 联合空战演习，美国空军 KC-135E 在内利斯空军基地进行飞行前检查。（Two maintainers assigned to the 22nd Aircraft Maintenance Squadron, McConnell Air Force Base, Kan., wait for the aircrew of a KC-135 Stratotanker to finish pre-flight inspections prior to a Red Flag 15-4 sortie at Nellis AFB, Nev., Aug. 25, 2015. Red Flag is a realistic combat training exercise involving the air, space and cyber forces of the U.S. and its allies, and is conducted on the vast bombing and gunnery ranges on the Nevada Test and Training Range during day and night operations.）

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