The Tomb of the Unknown Soldier is a monument dedicated to unidentified soldiers who died in military service. It serves as a symbol of honor and remembrance for all those who have sacrificed their lives for their country. The most famous tomb is located at Arlington National Cemetery in Virginia, where it was established in 1921. The tomb is guarded by the U.S. Army's 3rd Infantry Regiment, known as "The Old Guard." These soldiers perform a ceremonial duty, ensuring that the tomb remains a place of respect and reflection. The changing of the guard is a significant event, attracting visitors who wish to pay their respects.