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A US Army soldier, from the 3rd Infantry Regiment, walks his tour at... News PhotoArlington - Virginia,Arlington National Cemetery,Army Soldier,Arts Culture and Entertainment,Cemetery,Horizontal,Tomb,US Military,USA,Virginia,WalkingPhotographer Collection: AFP 2012 AFPA US Army soldier, from the 3rd Infantry Regiment, walks his tour at the Tomb of the Unknowns at Arlington National Cemetery December 22, 2012 in Arlington, Virginia. The Army's 3rd Infantry Regiment, known as The Old Guard, has kept watch day and night over the site in Northern Virginia since 1948 without a moment's lapse. AFP PHOTO/Karen BLEIER (Photo credit should read KAREN BLEIER/AFP/Getty Images)