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红旗 15-4 联合空战演习，美国空军 KC-135R 在内利斯空军基地整备，一架“猛禽”战机从一旁滑过。（A maintainer assigned to the 22nd Aircraft Maintenance Squadron, McConnell Air Force Base, Kan., watches an F-22 Raptor taxi during Red Flag 15-4 at Nellis AFB, Nev., Aug. 25, 2015. Red Flag involves a variety of attack, fighter, bomber, reconnaissance, electronic warfare, airlift support and search and rescue aircraft.）