If you can make all those changes AND get rid of his shitty action movie attitude from Survival, then he might work. But he needs to have a believable personality, everyone can't be a hardass and I'd prefer it if almost no one was in this RP (at least not all the time)
I remind you, in Survival, he killed a sewer alligator with a katana and CUT OUT ITS HEART. This is more the gritty, personal drama type of RP that follows the show. So, yeah, just make sure you take care of that and you're good. Main thing is that a suppressor can be hard to find so having two on (and USING) two pistols at once is a bit much. Duel wielding pistols doesn't work. And in the military, (depending on branch) most people don't get a lot of training with handguns. You would literally get more and better practice at a civilian self defense course taught by a squared away school/instructor. Just for the record.