Horrifying History on Instagram: "The Tomb of the Unknown Soldier in Arlington National Cemetery has been under 24-hour armed guard every minute of every day since July 2, 1937. The vigil began in response to public disrespect and vandalism at the site in the early 1930s. The specific date of April 6, 1948, is when the 3rd U.S. Infantry Regiment (“The Old Guard”) was formally designated as the permanent ceremonial unit for the tomb. Prior to that, the continuous guard was maintained by various o