Four-Star General Mark Milley places flags in front of gravesite at Arlington National Cemetery during the "Flags In" tradition in Arlington, Virginia on May 24, 2018. Milley is 39th Army Chief of Staff of the Army and the highest ranking military officer in the the Army. The 3rd U.S. Infantry Regiment (The Old Guard) has honored veterans for more than 60 years by placing flags at their gravesites. Photo by Pat Benic/UPI