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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Members of the veterans support group "Ruck to Remember" walk along the National Mall in Washington, May 29, 2017, as they continue their Memorial Day march to Arlington National Cemetery.
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President Donald Trump participates in a wreath laying ceremony at Arlington National Cemetery in Arlington, Virginia, May 29, 2017.
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Playing a tribute to veterans, retired U.S. Navy yeoman Mark Stallins of Denver performs in Fort Logan National Cemetery, May 28, 2017, in southwest Denver, Colorado.
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A member of the National Park Service inspects the walkway at the World War II Memorial early in the morning before the Memorial Day events in Washington, May 29, 2017.