A KC-135 Stratotanker connects with a B-52H Stratofortress from Minot Air Force Base, N.D., during an aerial refueling mission over the Alaskan coastline as part of exercise Amalgam Dart 15-2 May 28, 2015. The annual North American Aerospace Defense Command exercise affords American and Canadian forces field training aimed at improving NORAD's operational capability in a binational environment. The exercise spanned two forward operating locations in Canada’s Northwest Territories, two U.S. Air Force bases in Alaska, and a mobile radar site in Resolute, Nunavut, as well as the sky over much of NORAD’s area of responsibility. (U.S. Air Force photo/Staff Sgt. Benjamin W. Stratton)