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In this file photo, a B-1 bomber from the 34th Expeditionary Bomb Squadron leads a formation with fighters in front of U.S. Navy and Japan Maritime Self-Defense Force ships during exercise Keen Sword 17, which took place Oct. 30 to Nov. 11, 2016, in the Pacific Ocean. Keen Sword is a bilateral exercise between the Japanese Self-Defense Force and the United States designed to strengthen the Japan-U.S. alliance and increase combined combat readiness within the framework of the alliance.