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美国阿拉斯加州埃尔门多夫空军基地，北部边缘-2009 联合演习中，美国空军第90战斗机中队（90FS）飞行员在飞行前检查他的 F-22A 战斗机。（U.S. Air Force Lt. Col. John Hillyer conducts preflight checks on his F-22 Raptor stealth fighter June 17, 2009, during Exercise Northern Edge 09 at Elmendorf Air Force Base, Alaska. Northern Edge, Alaska's largest military training exercise, prepares joint forces to respond to crises throughout the Asia-Pacific region.）

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