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In this file photo, a formation of Japan Self-Defense Force, U.S. Air Force and Royal Australian Air Force C-130 Hercules aircraft fly over North Field, Tinian, Marianna Islands, during Cope North 15, Feb. 26, 2015. North Field served as the World War II headquarters for the 509th Composite Group that launched the atomic bomb attacks against Hiroshima and Nagasaki, Japan, in August of 1945. 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.