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美国内华达州内利斯空军基地，红旗 12-4 联合空战演习中，美国空军第421战斗机中队（犹他州希尔空军基地，421FS）三架 F-16CG 战斗机编队飞越内华达试验和训练靶场。(A formation of three F-16 Fighting Falcon aircraft with the 421st Fighter Squadron at Hill Air Force Base, Utah, flies over the Nevada Test and Training Range July 20, 2012, during Red Flag 12-4. Red Flag is an advanced aerial combat training exercise held four to six times a year to train pilots from the U.S., NATO and other allied countries for real combat situations.)

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