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 the authority vested by law in the President of the United States, the Congressional Medal of Honor, emblem of the highest military ideals and virtues, is bestowed in the name of Congress of the United States upon the unknown, unidentified Belgium soldier in a desire to add all that is possible to the imperishable glory won by the soldiers of Belgium who fought as comrades of the American soldiers during the World War, and to commemorate with them the deeds of the nations associated with the United States of America, by paying this tribute to their unknown dead (A.G. 220.523) (War Department General Orders, No. 52, 1 December 1922, Sec. I).
Citation text: U.S. Government, public domain.