The U.S. celebrates Memorial Day Monday.
Unofficially, the day has come to mark the beginning of summer for many Americans.
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.
Observances around the country and Washington are planned for the day.
In Washington, President Donald Trump will participate in a wreath-laying ceremony at the Tomb of the Unknown Soldier at Arlington National Cemetery.
Rolling Thunder holds wreath-laying events at the World War Two Memorial and the Vietnam Veterans Memorial. Rolling Thunder participants ride on motorcycles to bring attention to the lingering situation of prisoners of war and military service people who are missing in action.
The Veterans for Peace organization is holding several events in Washington to oppose what it says is "President Trump's outrageous budget proposal, including a $54 billion increase for the Pentagon."
Memorial Day began in 1865, just after the end of the Civil War, when a group of former slaves held what is seen as the first commemoration of the nation's war dead.