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北部边缘-2015 联合演习中，美国空军第507空中加油联队（507ARW）的 KC-135E 空中加油机正在艾尔森空军基地降落。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 U.S. Air Force KC-135 Stratotanker, assigned to the 507th Air Refueling Wing, Tinker Air Force Base, Okla., lands at Eielson Air Force Base, Alaska, June 18, 2015, following a training mission during Exercise Northern Edge 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 Airmen, Soldiers, Sailors, Marines and Coast Guardsmen from active duty, Reserve and National Guard units are involved.）