Mission: Uh-1H “Huey” helicopter lands at the San Joaquin National Cemetery for static display during the Memorial Day ceremonies on May 29, 2016.

Memorial Day, which is observed on the last Monday of May, commemorates the men and women who died while in the military service. In observance of the holiday, many people visit cemeteries and memorials, and volunteers often place American flags on each grave site at national cemeteries. A national moment of remembrance takes place at 3:00 p.m. local time.