in 1921
1921.
The Tomb of The Unknown Soldier was named The Tomb of The Unknown Soldier because the soldiers are unknown and they are honored in a tomb.
The Unknown Soldier of the Vietnam War was exhumed on May 14, 1998, because investigation had lead to identification of the body. DNA tests showed that this identification was correct. There is a link below.
President Warren G. Harding dedicated it in 1921.
The unknown soldier from WWI was interred at the Tomb of the Unknown Soldier in Arlington National Cemetery on Nov 11, 1921 with President Warren G Harding acting as next of kin. He proclaimed that day to be Veteran's day.
Tomb of the Unknown Soldier in Bucharest was created in 1923.
Tomb of the Unknown Soldier - Damascus - was created in 1994.
Tomb of the Unknown Soldier - Moscow - was created in 1967.
In most countries, the tomb of the unknown soldier is exactly that. The remains of an unknown and unidentified are contained in it.
The Tomb of the Unknown Soldier is guarded by Soldiers, not Marines.
The Tomb of the Unknown Soldier is located in Arlington, Virginia. It is also sometimes referred to as the Tomb of the Unknowns.