reporters' questions. pamela, i know you're working your sources. we'll get back to you. let's get some context now. fort hood is certainly a sprawling u.s. army baseme it's america's largest army base. the shooting what was in the medical brigade building, that according to a soldier who lives nearby. tom foreman is joining us to give us a little bit more on exactly how this was unfolding and the nature of this huge base, tom. >> reporter: wolf, this is a big sprawling base. it's a big sprawling base for a reason this. base was actually founded to deal with issues of tank warfare many many years ago. so they needed a lot of land around for that purpose. basically the main part of the base is laid out through here, wolf, in sort of a rectangular pattern side to side. we go to the main gate of the base, this is the one that was shut down fairly early on in this process. and a lot of focus was right here for awhile in terms of making sure they knew who was coming and who was going. if you go down this road though