Brian Flinchum, age 7, of Jamestown, N.C., for his question:

WHEN WAS THE TOMB OF THE UNKNOWN SOLDIER BUILT?

In Arlington, Va., the U.S. servicemen who gave their lives during the wars are honored at the Tomb of the Unknown Soldier.

An unknown soldier who had been killed during World War I was buried with honors on Nov. 11, 1921. His tomb, completed 10 years later, is a white marble sarcophagus on which is inscribed: "Here rests in honored glory an American soldier known but to God.''

After World War II and the Korean war, Congress directed that an "Unknown American'' from each of these wars be buried near the Unknown Soldier. An unknown sailor and soldier were buried in marble capped crypts at the head of the Tomb of the Unknown Soldier on Memorial Day in 1958. An honor guard is on duty 24 hours a day.