USNS Tippecanoe, center, refuels two Japan Maritime Self Defense Force Escort Flotilla ships in the East China Sea, Dec. 5, 2010. The ships are participating in Keen Sword 2011, a bilateral exercise between the U.S. and Japanese navies. USNS Tippecanoe, center, refuels two Japan Maritime Self Defense Force Escort Flotilla ships in the East China Sea, Dec. 5, 2010. The ships are participating in Keen Sword 2011, a bilateral exercise between the U.S. and Japanese navies. SHARE: Download: Full Size (0.72 MB) Tags: Photo Essays Credit: VIRIN: 985870-G-CTR43-105.jpg Photo Gallery