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PHILIPPINE SEA (Nov. 8, 2018)The aircraft carrier USS Ronald Reagan (CVN 76), left, and the Japanese helicopter destroyer JS Hyuga (DDH 181), right, sail in formation with 16 other ships from the U.S. Navy and Japan Maritime Self-Defense Force (JMSDF) as aircraft from the U.S. Air Force and Japan Air Self-Defense Force fly overhead in formation during Keen Sword 2019. Keen Sword 2019 is a joint, bilateral field-training exercise involving U.S. military and JMSDF personnel, designed to increase combat readiness and interoperability of the Japan-U.S. alliance.