Secretary of Defense Ash Carter speaks to sailors on the flight deck of the USS Carl Vinson, Thursday, Sept. 29, 2016 at Naval Air Station, North Island in Coronado, Calif. Defense Secretary Ash Carter on Thursday said the U.S. will "sharpen our military edge" in Asia and the Pacific in order to remain a dominant power in a region feeling the effects of China's rising military might. Carter made the pledge in a speech aboard the aircraft carrier USS Carl Vinson in port in San Diego. (Nelvin C. Cepeda/The San Diego Union-Tribune via AP)
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