181108-N-AV746-0110 PHILIPPINE SEA (Nov. 8, 2018) The Japan Maritime Self-Defense Force (JMSDF) Murasame-class destroyer JS Kirisame (DD 104) and the JMSDF Hatsuyuki-class destroyer JS Asayuki (DD 132) steam in formation with other ships from the U.S. Navy and JMSDF during exercise Keen Sword 19. Keen Sword 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 1st Class Timothy M. Black/Released)