English: Members of the Japan Ground Self-Defense Force practice with the Howa 84RR rocket system as part of trench warfare training during Exercise Iron Fist 2013 at the Marine Corps Air Ground Combat Center at Twentynine Palms, Calif. Jan 30, 2013. The purpose of the bilateral exercise is to improve interoperability, enhance military-to-military relations and to hone individual and small unit skills necessary for effective crisis response and to effectively conduct contingency operations across the Pacific. (U.S. Marine Motion Imagery by Lance Cpl. Lonzo-Grei Thornton) Also available in high definition