WASHINGTON, March 6 -- The U.S. Department of War issued the following news: * * * Tomb of the Unknown Soldier Marks 100 Years Since First Guard Posting * "We do not know from whence he came, but only that his death marks him with everlasting glory of an American dying for his country," said President Warren G. Harding, Nov. 11, 1921. Harding delivered the remarks during the burial ceremony for the Unknown Soldier of World War I, whom he symbolically "fathered" as next of kin. World War  more