According to law, Major Hasan commited murder. That's the way I see it too. But in Hasan's mind, he was a Soldier of Allah. So, some will see it an act of war against the state by a non-state entity.
It will be interesting to see what primary defense will be raised. I expect some sort of mental capacity plea will be made, although that seems a hard sell under the UCMJ.

A very interesting plea would be to plead combatant immunity (Soldier of Allah, etc.). I can think of many reasons why that won't work - which is probably why it has not been pleaded by any of the Gitmo detainees. To my knowledge, none of them has formally claimed GC III protections as an enemy combatant entitled to EPW treatment; except for some rumblings about that by a defense expert witness in the Hamdan trial. A combatant immunity claim under the Hasan facts would be a real case of "first impression".

To make that plea, the defense would have to lay out all of MAJ Hasan's AQ connections (if any). So, a nutjob defense seems most likely.

Regards

Mike