photo #9110591

The Tomb of the Unknown Soldier at Arlington National Cemetery in Virginia reached a milestone of being continuously guarded by service members for 100 years on March 25. The tomb was established in the wake of World War I, when an unknown soldier who died in the war was interred on Nov. 11, 1921, but did not have an assigned military guard until March 25, 1926. It was a daytime guard until July 1, 1937, when it became guarded 24 hours a day, seven days a week in all weather conditions.