After World War I, as the day came to be observed in honour of those who had died in all U.S. wars, its name changed from Decoration Day to Memorial Day. Since 1971 Memorial Day has been observed on the last Monday in May. A number of Southern states also observe a separate day to honour the Confederate dead. Memorial Day is observed with the laying of a wreath at the Tomb of the Unknowns in Arlington National Cemetery in Arlington, Virginia, and by religious services, parades, and speeches nationwide. Flags, insignia, and flowers are placed on the graves of veterans in local cemeteries. The day has also come to signal the beginning of summer in the United States.