PHILIPPINE SEA (Nov. 8, 2018) The aircraft carrier USS Ronald Reagan (CVN 76), left, and the Japan Maritime Self-Defense Force helicopter destroyer JS Hyuga (DDH 181), right, sail in formation with 16 other ships from the U.S. Navy and the Japan Maritime Self-Defense Force as aircraft from the U.S. Air Force and Japan Air Self-Defense Force fly overhead in formation during Keen Sword 2018. Keen Sword 2018 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. U.S. Navy photo by Mass Communication Specialist 2nd Class Kaila V. Peters