The Tomb of the American this, for a serviceman killed in WWI, was established in 1921
[DOC] [TLE] Dedication of the Tomb of the Unknowns - Nov 11, 1921 - HISTORY ... [PAR] Exactly three years after the end of World War I, the Tomb of the Unknowns is ... 
an unknown American soldier, who had fallen somewhere on a World War I ... 
placed below his coffin so that he might rest forever atop the earth on which he 
died.