you pull so many hrs guarding the unknos and night urs. there definite is a presence.sike nothing else you coulever imagine. it's a cemery, so of course pele have ghost stories, but it three unknowns thatot your back, and you're out there otecting them, and in tur they're protecting you. rrator: the precision ofheir uniforms, the asured steps, the acting ritual bear srk contrast to the vd left by what is unkwn: the names of thesend others forever lost in the chaos of war. the marble tomb liesbove the grave of an unknown soldr of world war i, interredere in 1921. under the whitplaza stones in frontf the tomb lie e remains of unknowns from world war ii and korea, terred in 58. between these two li an empty crypt, once containing the remains of a vietnam war unkno. remarkably, the downed pilotas later identified by dntesting. the whole of arlingt national cemetery-- over 600 rolling acres-- stands as a monume to those who have saificed for their country. the unending row of simple white tombones evoke the image soldiers in perfectormation. the cemetery was established in