Keen Sword A Marine Corps MV-22B Osprey spins up during Keen Sword 23 at Kumamoto Airport, Japan, Nov. 15, 2022. Keen Sword is a biennial training event that exercises the capabilities and lethality developed between Marines and the Japan Self Defense Force. SHARE: Download: Full Size (6.04 MB) Tags: marine corps, keen sword, indo-pacific Credit: Marine Corps Lance Cpl. Justin Marty VIRIN: 221115-M-GV442-2927.JPG Photo Gallery