WATCH: The crowds may be gone at Arlington National Cemetery this Memorial Day, but the Changing of the Guard still goes on. Sentinels from the 3rd U.S. Infantry Regiment, known as "The Old Guard,” stand watch over the Tomb of the Unknown soldier 24 hours a day, 365 days a year. The Changing of the Guard ceremony -- which happens every half hour during the spring and summer -- now includes more distancing between personnel, and soldiers now wear face masks in their quarters as they prepare for t

The Changing of the Guard Ceremony is an elaborate ritual that occurs at the Tomb of the Unknown Soldier and is one of the most popular attractions in Arlington National Cemetery. During The Changing of the Guard an impeccably uniformed relief commander conducts a detailed white-glove inspection of the incoming Sentinel's weapon, carefully checking each part of the fully functional M14 rifle once. (U.S. Army video by Sgt. George Huley and Pfc. Gabriel Silva) | 3d U.S. Infantry Regiment (The Old