At the 11th hour of the 11th day of the 11th month, in the year 1918, World War I ended. Celebrated as Armistice Day, it was changed to Veterans Day after World War II. In 1921, President Warren Harding had the remains of an unknown soldier killed in France buried in Arlington Cemetery. He requested that "All ... citizens ... indulge in a period of silent thanks to God for these ... valorous lives and of supplication for His Divine mercy ... on our beloved country." Inscribed on the Tomb are the words: "Here lies in honored glory an American soldier know but to God."