Army Capt. Eric Wagner, right, hold American flags, while Army Capt. Alli Thornton places an American flag in front of a headstone during "Flags In" at Arlington National Cemetery in Arlington, Va., May 25, 2017. Wagner is a physician assistant and Thornton is a physical therapist assigned to the 4th Battalion, 3rd U.S. Infantry Regiment, known as "The Old Guard." DoD photo by Sebastian J. Sciotti Jr.