It's another, earlier name for Memorial Day
But during World War I the 
United States found itself embroiled in another major conflict, and the ... which 
established Memorial Day as the last Monday in May in order to create a three-
day... [DOC] [TLE] Memorial Day [PAR] Memorial Day, originally called Decoration Day, is a day of remembrance for 
those who have died ... by President Lyndon Johnson in May 1966, it's difficult to 
prove conclusively the origins of the day.