President Barack Obama walks with Maj. Gen. Karl Horst, commander of the U.S. Army Military District of Washington, his wife Nancy, and first lady Michelle Obama before placing a wreath at the Tomb of the Unknowns(无名之墓) on Memorial Day(阵亡将士纪念日，美国假日，通常为五月的最后一个星期一) at Arlington National Cemetery(阿灵顿国家公墓), Monday, May 30, 2011.
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President Barack Obama speaks with family of a fallen soldier on Memorial Day in Section 60 of Arlington National Cemetery(阿灵顿国家公墓第60区).
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President Barack Obama speaks at the Memorial Day ceremony at the amphitheater(露天剧场) at Arlington National Cemetery.
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President Barack Obama, with Maj. Gen. Karl Horst, commander of the U.S. Army Military District of Washington, left, places a wreath at the Tomb of the Unknowns during a Memorial Day ceremony at Arlington National Cemetery.
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President Barack Obama, Defense Secretary Robert Gates, center, and Chairman of the Joint Chiefs of Staff([由美国海陆空三军和海军陆战队组成的]参谋长联席会议 ) Adm. Michael Mullen, left, are listen to the playing of "Taps"(葬礼号) during a Memorial Day ceremony at Arlington National Cemetery.
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President Barack Obama talks to family of fallen soldiers near the graves in Section 60 of Arlington National Cemetery on Memorial Day.
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President Barack Obama, Defense Secretary Robert Gates, Chairman of the Joint Chiefs of Staff Adm, Michael Mullen participate in the Memorial Day ceremony at Arlington National Cemetery.
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President Barack Obama pays tribute(致敬) those who made the ultimate sacrifice and their families during the Memorial Day ceremony in the amphitheater at Arlington National Cemetery.