Memorial Day (previously but now seldom called Decoration Day) is a federal holiday in the United States for remembering and honoring the military personnel who died while serving in the United States Armed Forces. The holiday is now observed on the last Monday of May, Memorial Day having been observed on May 30 from 1868 to 1970.
Many people visit cemeteries and memorials on Memorial Day, particularly to honor those who died in military service. Many volunteers place an American flag on each grave in national cemeteries.
Two other days celebrate those who serve or have served in the U.S. military: Veterans Day, which celebrates the service of all U.S. military veterans; and Armed Forces Day, a minor U.S. remembrance celebrated earlier in May, specifically honoring those currently serving in the U.S. military.