The Tomb of the Unknown Soldier is a monument located in Arlington National Cemetery in Arlington, Virginia, United States. 1. Purpose: The Tomb of the Unknown Soldier serves as a tribute to unidentified soldiers who have died in war and whose remains could not be identified. It is a symbol of honor and remembrance for all unknown soldiers who made the ultimate sacrifice. 2. Construction: The tomb was authorized by the U.S. Congress in 1921, and construction began in 1931. It was completed and dedicated on November 11, 1932 (Armistice Day). 3. Design: The tomb is made of white marble and stands atop a hill overlooking Washington, D.C. The design is based on the ancient Greek and Roman mausoleums, with a rectangular base and a massive sarcophagus on top. 4. Inscription: The front of the tomb bears the inscription, "Here rests in honored glory an American soldier known but to God." This inscription reflects the purpose of the tomb and its significance as a resting place for unidentified soldiers. 5. Guarded 24/7: The Tomb of the Unknown Soldier is guarded by the United States Army's 3rd Infantry Regiment, also known as "The Old Guard." This elite unit is responsible for maintaining a constant vigil at the tomb, regardless of weather conditions or other circumstances.

6. Changing of the Guard: The Changing of the Guard ceremony takes place every hour from October 1 to March 31, and every half-hour from April 1 to September 30. During the ceremony, the relief commander and relief sentinel conduct a meticulous changing of the guard ritual to ensure continuous respect and honor for the unknown soldiers. 7. Sentinels: The sentinels who guard the tomb undergo extensive training and are selected based on their discipline, professionalism, and physical ability. They must meet strict height and weight requirements and demonstrate exceptional character and dedication. 8. Unknown Soldiers: The tomb initially held the remains of one unknown soldier from World War I. Later, unknown soldiers from World War II, the Korean War, and the Vietnam War were also interred there. The Vietnam War unknown soldier was exhumed in 1998 and identified through DNA testing, but the crypt remains empty as a symbol of all those who remain unidentified. 9. Memorial Day Tradition: On Memorial Day, a wreath-laying ceremony takes place at the Tomb of the Unknown Soldier, honoring all American service members who have died in war. This tradition dates back to 1948 and serves as a solemn reminder of the sacrifices made by the nation's military personnel. 10. Symbolic Importance: The Tomb of the Unknown Soldier represents the collective sacrifice of all unknown soldiers throughout history. It serves as a powerful symbol of gratitude, remembrance, and reverence for those who have given their lives for their country.The Tomb of the Unknown Soldier is an iconic memorial that honors the courage and sacrifice of unidentified soldiers who have fought and died for their country.