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The Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va. is guarded 24 hours a day with a shift change ceremony every hour. (SHNS photo by Cecilia Monarrez / Scripps Howard News Service)

The Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va. is guarded 24 hours a day with a shift change ceremony every hour.  (SHNS photo by Cecilia Monarrez / Scripps Howard News Service)