Members of the Japan Ground Self-Defense Force swim off the coast of Red Beach during Exercise Iron Fist 2015 aboard Camp Pendleton, Calif., Feb. 3, 2015. Exercise Iron Fist is a bilateral training exercise between the U.S. Marine Corps and the Japan Ground Self-Defense Force, meant to strengthen interoperability between the two militaries, now in its 10th iteration. (U.S. Marine Corps photo by Cpl. David Gonzalez, 13th Marine Expeditionary Combat Camera/ Released)