Tomb of the Unknown Soldier, Arlington, VA
Memorial Day Definition:
Memorial Day is a US federal holiday wherein the men and women who died while serving in the United States Armed Forces are remembered. The holiday, which is celebrated every year on the final Monday of May, was formerly known as Decoration Day and originated after the American Civil War to commemorate the Union and Confederate soldiers who died in the Civil War. By the 20th century, Memorial Day had been extended to honor all Americans who have died while in the military service. [source: Wikipedia]
Flags should be flown at half-staff until noon, then raised to full height.