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北部边缘-2015 联合演习中，美国空军第525战斗机中队（525FS）一架 F-22A 战斗机任务后返回埃尔门多夫-理查森联合基地。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。（A F-22 Raptor from the 525 Fighter Squadron returns from a mission during Exercise Northern Edge 15 at Joint Base Elmendorf-Richardson, June 18, 2015. Northern Edge 15 is Alaska’s premier joint training exercise designed to practice operations, techniques and procedures as well as enhance interoperability among the services. Thousands of participants from all services; active duty, Reserve and National Guard units are involved.）