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United States Ambassador to Japan Caroline Kennedy arrives with Japan Minister of Defense Gen Nakatani (right) at the Japan Ground Self-Defense Force Middle Army Headquarters on Camp Itami, Japan, Dec. 9. Kennedy visited with U.S. and Japan Self-Defense Force service members to observe Yama Sakura 69 operations. Yama Sakura is a two-week training event and the largest bilateral command post exercise for the two nations, with more than 6,500 service members participating.