By special acts of Congress, the Medal of Honor was bestowed on the Unknown Soldiers of the United States who rest at the Tomb of the Unknown Soldier in Arlington National Cemetery, and — as a gesture of shared sacrifice after World War I — on the Unknown Soldiers of Belgium, France, Great Britain, Italy and Romania.
The Vietnam Unknown was identified through DNA testing in 1998 as Air Force First Lieutenant Michael Blassie and returned to his family; the crypt now stands empty as a tribute to all missing service members.
Official Medal of Honor citation
By virtue of a joint resolution of Congress, approved 12 October 1921, the Medal of Honor, emblem of the highest ideals and virtues, is bestowed in the name of Congress of the United States upon the unknown, unidentified Italian soldier to be buried in the National Monument to Victor Emanuel II, in Rome.
Whereas the Congress has authorized the bestowal of the Congressional Medal of Honor upon the unknown, unidentified British and French soldiers buried in Westminster Abbey, London, England and the Arc de Triomphe, Paris, France, respectfully, who fought beside our soldiers in the recent war; and
Whereas, animated by the same spirit of friendship toward the soldiers of Italy who also fought as comrades of the American soldiers during the World War, we desire to add whatever we can to the imperishable glory won by their deeds and to participate by paying tribute to their unknown dead: Now therefore,
Be it resolved by the Senate and House of Representatives of the United States of America in Congress assembled, that the President of the United States be, and he is hereby, authorized to bestow, with appropriate ceremonies, military and civil, the Congressional Medal of Honor upon the unknown unidentified Italian soldier to be buried in the National Monument to Victor Emanuel II, in Rome, Italy (A.G. 220.523) (War Department General Orders, No. 52, 1 December 1922, Sec. III).
Citation text: U.S. Government, public domain.