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Arlington National Cemetery
Arlington National Cemetery, established June 15, 1864 on Robert E. Lee's seized estate, is the U.S. Army's largest national military cemetery: 639 acres, nearly 430,000 interments, Tomb of the Unknown Soldier, capacity crisis and Southern Expansion.
Tomb of the Unknown Soldier (Arlington)
Tomb of the Unknown Soldier at Arlington National Cemetery: memorial holding three unknown American service members (WWI, WWII, Korea), dedicated November 11, 1921, guarded 24/7 by The Old Guard Sentinels.