* * * By virtue of an act of Congress approved 24 August 1921, the Medal of Honor, emblem of highest ideals and virtues is bestowed in the name of the Congress of the United States upon the unknown American, typifying the gallantry and intrepidity, at the risk of life above and beyond the call of duty, of our beloved heroes who made the supreme sacrifice in the World War. They died in order that others might live (293.8, A.G:O.) (War Department General Orders, No. 59, 13 Dec. 1921, sec. I).