general said that he had some mental health issues. we know he bought a gun recently in the local area. but he's only been on base since february. we don't know what his motivations are, and those are the key questions that the federal investigators and the local officials are going to be working on in the next few days. these things are impossible to explain. they're not explain, especially to people wounded and killed. but they can try to put together a picture of what was going through his mind before he went on base today. >> bill gavin, i want to ask you this, lieutenant general mark millie said at this point, there's no indication that it is terrorism, but they're not ruling anything out or anything in. listen, nidal hasan was a member of the military against a member of the military and it was deemed to be terrorism. why not this one? >> that's because nidal hasan told them it was terrorism, told them the reason for doing this was, both religious reasons and