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In this file photo, U.S. Air Force, Japan Air Self-Defense Force and Royal Australian Air Force aircraft, fly in formation during a photo exercise at Cope North 15, Feb. 17, 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.