From CSM, Why military judge has hands full with Nidal Hasan court-martial (by Patrik Jonsson, June 4, 2013):

After determining that Hasan is mentally and physically fit to defend himself, the military judge, Col. Tara Osborn, is now weighing the extent to which she’ll allow him to pursue his main defense: that he was justified in killing US soldiers about to deploy to Afghanistan to prevent the imminent deaths of Taliban soldiers.
I'd like to see more on this defense - It looks to be some form of RCM 916 justification.

Regards

Mike