ARLINGTON, VA – NOVEMBER 11: US President Joe Biden pauses after placing a wreath during a centennial ceremony at the Tomb of the Unknown Soldier in Arlington National Cemetery on November 11, 2021, in Arlington, Virginia. The Tomb of the Unknown Soldier, serving as the heart of Arlington National Cemetery, has been the final resting place for one of America’s unidentified World War I service members, and unidentified soldiers from later wars were added in 1958 and 1984. The tomb plaza is open to the public this week for the first time in almost a hundred years. (Photo by Alex Brandon-Pool/Getty Images)

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