Why hasn’t Hasan been tried and executed yet? Get on with it. Just make sure that his beard doesn’t serve as a justification for a later dismissal or retrial (you can’t hang me because I was out of uniform during the trial so it doesn’t count).
Hasan is never going to be put on trial. He's going to be held for the rest of the life until he dies of natural causes or "accidentally".
It got almost no media attention, but Congress and the president quietly passed a law within the last year or so that permits American citizens to be held indefinitely without trial, and this law was very specifically passed for him.