Monday, May 31, 2021, is Memorial Day; a federal holiday in the United States for honoring and mourning the military personnel who have died in the performance of their military duties while serving in the United States Armed Forces. The holiday is observed on the last Monday of May.
Many people visit cemeteries and memorials on Memorial Day to honor and mourn those who died while serving in the U.S. Military. Many volunteers place an American flag on graves of military personnel in national cemeteries.
Memorial Day is also considered the unofficial start of summer in the United States.