Keen Sword Sub A U.S. Navy Los Angeles-class fast attack submarine participates in exercise Keen Sword with Submarine Group 7 and Japanese forces in waters south of Japan, Oct. 27, 2018. The exercise improves readiness and interoperability. SHARE: Download: Full Size (0.79 MB) Tags: Keen Sword, Navy Credit: Navy Chief Petty Officer Robert Gulini VIRIN: 181027-N-ZZ999-0101X.JPG Photo Gallery