Chuck Hagel

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U.S. Secretary of Defense Chuck Hagel delivers his speech to the U.S. military personnel upon his arrival at the U.S. Yokota Air Base on the outskirts of Tokyo, Saturday, April 5, 2014. Against the backdrop of Russia's takeover of Ukraine's Crimean region, Hagel said Saturday that a key message he will deliver to leaders in Tokyo this weekend is that the U.S. is strongly committed to protecting Japan's security. (AP Photo/Eugene Hoshiko)

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Lt. Gen. Salvatore Angelella, center bottom, the Commander, U.S. Forces Japan, gestures as U.S. Secretary of Defense Chuck Hagel, back left, listens to questions from the U.S. military personnel upon his arrival at the U.S. Yokota Air Base on the outskirts of Tokyo, Saturday, April 5, 2014. Against the backdrop of Russia's takeover of Ukraine's Crimean region, Defense Secretary Chuck Hagel said Saturday that a key message he will deliver to leaders in Tokyo this weekend is that the U.S. is strongly committed to protecting Japan's security. (AP Photo/Eugene Hoshiko)

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U.S. Secretary of Defense Chuck Hagel disembarks the plane upon his arrival at the U.S. Yokota Air Base on the outskirts of Tokyo, Saturday, April 5, 2014. (AP Photo/Eugene Hoshiko)

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Airmen line up to shake hands with U.S. Secretary of Defense Chuck Hagel at the U.S. Yokota Air Base on the outskirts of Tokyo, Saturday, April 5, 2014. (AP Photo/Eugene Hoshiko)

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U.S. Secretary of Defense Chuck Hagel delivers his speech to the U.S. military personnel upon his arrival at the U.S. Yokota Air Base on the outskirts of Tokyo, Saturday, April 5, 2014. Against the backdrop of Russia's takeover of Ukraine's Crimean region, Hagel said Saturday that a key message he will deliver to leaders in Tokyo this weekend is that the U.S. is strongly committed to protecting Japan's security. (AP Photo/Eugene Hoshiko)