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美国阿拉斯加州埃尔门多夫空军基地，红旗-阿拉斯加 09-2 联合空战演习中，一架北约 E-3A 空中预警机正在降落。（ELMENDORF AIR FORCE BASE, Alaska -- An E-3 Airborne Warning and Control System from the North Atlantic Treaty Organization prepares to touch the tarmac after participating in Red Flag Alaska 09 on Thursday, April 30. This exercise enables flying squadrons to enhance their fighting capabilities in simulated combat sorties in a realistic threat environment.）