That is a really good question. Another good question would be, why did they stop? Or better yet, who made them stop. Who can stop the FBI. Possibly the Attorney General. Isn't the Attorney General the guy who's law firm defends the prisoners at Gitmo.
Some guest on Fox was saying that even though the FBI was investigating him, the military kept him on board because 1) they wanted to be paid back for all the money invested in his education and 2) there is SO much PTSD running rampant that they need all the shrinks they can get.