U.S. Marines with Echo Battery, 2nd Battalion, 11th Marine Regiment fire high-explosive projectiles from 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.