Flags In Soldiers assigned to the 3rd U.S. Infantry Regiment, known as "The Old Guard" place American flags at headstones in Arlington National Cemetery, Arlington, Va., May 23, 2019. The 55-year-old tradition called Flags In is held annually prior to Memorial Day. SHARE: Download: Full Size (1.43 MB) Tags: Memorial Day, old guard, Army Credit: Elizabeth Fraser, Army VIRIN: 190523-A-IW468-348X.JPG Photo Gallery