A soldier from Japan's Ground Self Defense Force takes up a defensive position as he trains alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





U.S. Marines take up a defensive position as they train with soldiers from Japan's Ground Self Defense Force during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





A soldier from Japan's Ground Self-Defense Force holds his weapon while training alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





Soldiers from Japan's Ground Self-Defense Force, with the help of a U.S. Marine, drive a Amphibious Assault Vehicle ashore as they train alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





A soldier from Japan's Ground Self Defense Force takes up a defensive position as he trains alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





Soldiers from Japan's Ground Self-Defense Force carry one of their men to a waiting Osprey aircraft as they train alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





A U.S. Marine watches as an Osprey tilt-rotor aircraft takes off near the beach on Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





Soldiers from Japan's Ground Self Defense Force come ashore in amphibious assault vehicle as they train alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





Soldiers from Japan's Ground Self Defense Force take up defensive position as they train alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





A soldier from Japan's Ground Self Defense Force takes up a defensive position as he trains alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





Soldiers from Japan's Ground Self Defense Force come ashore in amphibious assault vehicles as they train alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





A U.S. Marine Osprey aircraft comes in to land as Japan's Ground Self Defense Force train alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





Soldiers from Japan's Ground Self Defense Force learn some trauma procedures from the U.S. Navy and U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





A U.S. Marine Osprey compresses air off its rotors during takeoff from the beach as Japan's Ground Self Defense Force train alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





An officer from Japan's Ground Self Defense Force holds a pamphlet as he attends training with U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





The U.S. Navy's USS Somerset sails past a U.S. Marine as soldiers from Japan's Ground Self Defense Force train alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





Soldiers from Japan's Ground Self Defense Force carry a fellow soldier simulating a casualty, to an awaiting Osprey aircraft as they train alongside U.S. Navy medics and U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)





Soldiers from Japan's Ground Self Defense Force come ashore in amphibious assault vehicles as they train alongside U.S. Marines during the bilateral annual Iron Fist military training exercise in Camp Pendleton, California February 26, 2016. (Photo by Mike Blake/Reuters)