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红旗 17-3 联合空战演习，美国空军第34轰炸机中队一架B-1B从内利斯空军基地起飞。（A B-1B Lancer from the 34th Bomber Squadron, Ellsworth Air Force Base, S.D., takes off as an HH-60G Pave Hawk helicopter from the 66th Rescue Squadron flies in the background during Red Flag 17-3 at Nellis Air Force Base, Nev. July 24, 2017. Red Flag 17-3 is primarily conducted over the Nevada Test and Training Range, 2.9 million acres of land and 5,000 square miles of airspace restricted from civilian air traffic over-flight.）