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 27, 2021. The tradition, known as “Flags In,” is held annually prior to Memorial Day to honor the nation’s fallen veterans. SHARE: Download: Full Size (6.12 MB) Credit: Elizabeth Fraser, Army VIRIN: 210527-A-IW468-727.JPG Photo Gallery