181027-N-ZZ999-0101 WATERS SOUTH OF JAPAN (Oct. 27, 2018) A Los Angeles-class fast attack submarine participates in exercise Keen Sword with Submarine Group 7 and Japan Maritime Self-Defense Force (JMSDF) Sailors and staff, Oct. 27, 2018. Exercise Keen Sword is a joint and bilateral training exercise between the U.S. military and their JSDF counterparts. For the submarine force, it is an opportunity to demonstrate how both countries’ submariners would detect, locate, track and engage enemy assets. (U.S. Navy photo by Chief Electronics Technician Robert Gulini/Released)