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In this file photo, a U.S. Air Force KC-135 Stratotanker from the 909th Aerial Refueling Squadron, Kadena Air Base, Japan, refuels a F-16 Fighting Falcon from the 14th Fighter Squadron, Misawa Air Base, Japan, during an exercise sortie flown at Cope North 15, Feb. 20, 2015, off the coast of Guam. Through training exercises such as Exercise Cope North 15, the U.S., Japan and Australia air forces develop combat capabilities, enhancing air superiority, electronic warfare, air interdiction, tactical airlift and aerial refueling.