people that work in that building. those people themselves have a building access badge. they have something that they go through a turnstile, they swipe a badge, they show an officer their i.d. so, there's a picture on there. they have to show a visual confirmation to an officer that they are who they are swiping in to be. and then they can access the building. well, you also mentioned visitors. basically, anyone who has a common access card, which is a card that most members of the military, many d.o.d., department of defense officials have, if they have that card, they can access the navy yard and navy sea systems command as long as they show that and go through a visitors' entrance, and they get magged, they get swiped, they go through security, but they can actually access the building with their common access card. >> we don't know yet about whether or not this young man's employment as a civilian government contractor working in i.t., his apparent security clearance we're learning