The U.S. celebrates Memorial Day. Officially, Memorial Day, observed on the last Monday in May, has been set aside to honor all who died during military service throughout U.S. history. Congress declared Memorial Day a national federal holiday in 1971.
In Pictures: US Observes Memorial Day
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Flags mark graves at Leavenworth National Cemetery on the eve of Memorial Day, May 28, 2017, in Leavenworth, Kansas.