U.S. Marines operate an Amphibious Assault Vehicle as part of a mechanized raid during Exercise Iron Fist 2015 aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Feb. 13, 2015. Exercise Iron Fist 2015 is the 10th anniversary of 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. (U.S. Marine Corps photo by Cpl. David Gonzalez, 13th Marine Expeditionary Combat Camera/ Released)