Requiem Masses are masses that are offered for the dead. They derive their name from the first word of the Introit, which may be traced to the Fourth Book of Esdras, one of the Apocrypha, at the passage "Expectate pastorem vestrum, requiem æternitatis dabit vobis".
Memorial Day (originally known as Decoration Day) is a federal holiday in the United States for mourning the U.S. military personnel who have died while serving in the United States armed forces. It is observed on the last Monday of May. It was formerly observed on May 30 from 1868 to 1970.