I had bizarre neuro-related problems after my time on the ground in Gulf War I - and we had British Fox chem alarms going off constantly. I have no doubt we were exposed at some level. Luckily, I recovered fully for the most part.
Can't imagine dealing with the kind of trauma this young man and many others like him have experienced. I manage a rehab center and so see the impact of these kinds of injuries on individuals. What a great attitude he's got. His parents must be proud of him.
I have mixed feelings about my son going into the military in the future. I wouldn't discourage him, but I also wouldn't encourage him as I think its a highly personal decision and I wouldn't want him doing it to 'make me proud'. I'd want him doing it for his own reasons.