U.S. Marines with Echo Battery, 2nd Battalion, 11th Marine Regiment load an M120 120 mm mortar system on San Clemente Island, Calif., Feb. 13, 2014, during exercise Iron Fist 2014. 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 capabilities.