"...unusual circumstances with NORMAL coping skills..." 

From that statement alone I assess he is cognitively intact. However, I think it is going to be a while before he is exposed to the real world. Considering there is such a level of hatred among his former platoon members, he won't be brought to that reality for some time. His circumstances have become so political I doubt he will be up to that level of resilience soon, if at all.

I wish his family solace in their time waiting for their son to be well enough to see them again.