IRON FIST EXERCISE A U.S. 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 at 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 designed to increase interoperability between the two services, while aiding the Japanese in their continued development of amphibious SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 769120-J-TGC34-492.jpg Photo Gallery