U.S. Navy Veteran Mike Rafter, U.S. Army Corps of Engineers, Baltimore District, Construction Services Branch chief, pays tribute at the Arlington National Cemetery's Tomb of the Unknown Soldier in Arlington, Va., Oct. 22, 2021. One hundred years after World War I Unknown's burial, the Tomb of the Unknown Soldier symbolizes service and sacrifice, mourning and memory. (U.S. Army photo by Greg Nash)