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Americans are paying tribute today, Memorial Day, to the sacrifices of service members in the nation's earliest conflicts and the newest.

President Obama laid a wreath at the Tomb of the Unknowns at Arlington National Cemetery, just outside Washington.

Some 5,000 people were at the grounds of the cemetery, which Obama called "more than a final resting place for fallen heroes." It is, he said, "a reflection of America itself. A reflection of our history, the wars we've waged for democracy, the peace we've laid to preserve it.

"It is a reflection of our diversity, of people from different races and creeds who fought for the ideals that bind us as one nation."

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