In this Feb. 13, 2013 photo, Japanese Ground Self-Defense Force soldiers and U.S. Marine take part in the U.S.-Japan joint military drill at the Camp Pendleton Marine Corps base, California. Japanese troops will converge on California's southern coast in the next two weeks, the middle of June 2013, as part of a military exercise with U.S. troops aimed at improving that country's amphibious attack abilities. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT

Associated Press
In this Feb. 13, 2013 photo, Japanese Ground Self-Defense Force soldiers and U.S. Marine take part in the U.S.-Japan joint military drill at the Camp Pendleton Marine Corps base, California. Japanese troops will converge on California's southern coast in the next two weeks, the middle of June 2013,  as part of a military exercise with U.S. troops aimed at improving that country's amphibious attack abilities. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT
In this Feb. 13, 2013 photo, Japanese Ground Self-Defense Force soldiers and U.S. Marine take part in the U.S.-Japan joint military drill at the Camp Pendleton Marine Corps base, California. Japanese troops will converge on California's southern coast in the next two weeks, the middle of June 2013, as part of a military exercise with U.S. troops aimed at improving that country's amphibious attack abilities. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT
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