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北部边缘-2006 联合演习中，美国空军第939空中加油联队（939ARW）一架 KC-135R 空中加油机在阿拉斯加湾上空等待受油机。（A KC-135 Stratotanker from the 939th Air Refueling Wing, Portland Air National Guard Base, Ore., awaits another receiver while flying over the Gulf of Alaska during a maritime excercise June 13, 2006, as part of exercise Northern Edge 2006. The joint exercise is one of a series of U.S. Pacific Command exercises that prepare joint forces to respond to crises in the Asian Pacific region.）

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