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北部边缘-2015 联合演习中，美国空军第249空运中队（249AS）一架 C-17A 运输机准备降落到阿拉斯加州唐纳利训练区野战机场。这是“北部边缘”演习4年之后再度举行，2013年由于财政紧缩停办了一届。（U.S. Air Force C-17 Globemaster III assigned to the 249th Air Lift Squadron, prepares to land during Exercise Northern Edge 15 at Joint Pacific Alaska Range Complex, Alaska, June 25, 2015. Northern Edge is Alaska’s premier joint training exercise designed to practice operations, techniques and procedures as well as enhance interoperability among the services. Thousands of service members from active duty, reserve and National Guard units are involved.）

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