IRON FIST EXERCISE A Marine steers a rigid-hull inflatable boat as it transports Japan Ground Self Defense Force soldiers during an amphibious training exercise as part of Iron Fist 2012 on Naval Amphibious Base Coronado, Calif., Jan. 22, 2012. Iron Fist is a three-week bilateral training event held annually between the U.S. Marine Corps and the Japan Ground Self Defense Force. SHARE: Download: Full Size (14.59955 MB) Tags: Week In Photos, Week In Photos Credit: VIRIN: 404206-W-KKI15-876.jpg Photo Gallery