U.S. Marines with Marine Medium Tiltrotor Squadron (VMM) 161 travel in MV-22B Osprey tiltrotor aircraft during Iron Fist 2014 to San Clemente Island, Calif., Feb. 14, 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.