The Arlington National Cemetery’s Tomb of the Unknown Soldier stands atop a hill overlooking Washington, D.C., in Arlington, Va., Oct. 22, 2021. To memorialize a century of honor, the Arlington National Cemetery has hosted a series of Centennial commemorative events, exhibits, and ceremonies that will culminate on Nov. 11 in conjunction with the National Veterans Day Observance. (U.S. Army photo by Greg Nash)