I have two close friends who are vets and sober in AA, all I can say is that he doesn't need any special veterans group to try out recovery. Back in the old days when AA started, everyone was a veteran, WW1. Then for many years, they were all WW2 or Korea. Having been in Viet Nam 50 years ago isn't his problem, booze is.
This is not to take away from his life experience but he will likely find plenty of combat vets in AA. One of my friends, (really more like a big brother to me), was an 18 y.o. Marine in VN in '69, he saw plenty of action. The war actually did contribute to his drinking and drugging when he got home but that was 45 years ago. His problems and solutions now don't have much to do w VN. FWIW, he has an amazing sober life today and I just had lunch w him in Minneapolis a couple weeks ago. He is about to retire from a great job at the University of MN. and his life is in full swing, great family and friends, has fun all the time, etc... He was NOT having fun the year before he got sober and clean back in 1989, I can tell you that.
The other buddy is a young guy, also a Marine but an Iraq vet. When he was in the military, he was beset by personal demons and wanted to die so bad that he volunteered and went back to Iraq and Afghanistan something like 4 times. He would max out his credit cards and just dive back into the battle, hoping to get killed but it never happened and he would come back to the same problems he had before he left. I love that guy, he is seriously the best. A sensitive, artistic soul who is tough but the antithesis of a macho, Rambo character. He was actually a raver before he enlisted, one of those guys in a jumpsuit at the all-night party w a glow stick on ecstasy.
Anyway, he's sober now and while life is never perfect, it's pretty darn good for him and if not sober, he would be one of those sad statistics of guys w PTSD.
I agree w others that a DUI doesn't make you an alcoholic, especially not w .08 these days. You could feel perfectly fine and get a DUI. But if he has a booze problem, there is a solution.