Memorial Day is a United States federal holiday observed on the last Monday of May (May 31 in 2010). Formerly known as Decoration Day, it commemorates U.S. men and women who died while in the military service. First enacted to honor Union soldiers of the American Civil War (it is celebrated near the day of reunification after the Civil War), it was expanded after World War I. 

 Memorial Day is much more than a three-day weekend that marks the beginning of summer. To many people, especially the nation's thousands of combat veterans, this day, which has a history stretching back all the way to the Civil War, is an important reminder of those who died in the service of their country.