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WASHINGTON, DC - DECEMBER 06: U.S. President Barack Obama and his family are joined by entertainers onstage while singing Christmas songs during the annual lighting of the National Christmas tree on December 6, 2012 in Washington, DC. This year is the 90th annual National Christmas Tree Lighting Ceremony. (Photo by Mark Wilson/Getty Images)

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SINGAPORE (Nov. 20, 2010) The amphibious dock landing ship USS Pearl Harbor (LSD 52) is moored pierside in Singapore for a scheduled port visit. Pearl Harbor is part of the Peleliu Amphibious Ready Group, which is transiting the U.S. 7th Fleet area of responsibility while en route to its homeport of San Diego. (U.S. Navy photo by Mass Communication Specialist 2nd Class Michael Russell/Released)