Memorial Day is a federal holiday in the United States for remembering and honoring people who have died while serving in the United States Armed Forces. The holiday is currently observed every year on the last Monday of May. Memorial Day was previously observed on May 30 from 1868 to 1970.

Memorial Day is considered the unofficial start of the summer vacation season in the United States. 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.

–Wikipedia