He entered through the national guard iirc. Guys that enter SF through the reserves or guard are switched to active duty if they make it . I know he has a reputation of being a dick in the SF Groups. He's a typical gym bully He's hurt more than a few soliders in hand to hand combat training and had to be reprimanded for it.
With all that said he's a top notch operator and probably could've joined CAG (combat application group, the unit, delta force, etc) if he didn't pursue a fighting career.
But this is the same guy who staged a break in at his house to promote his security system. So make up your own mind.
Funny tidbit. He's wife was Chuck Liddell's ex wife. I think Chuck's daughter actually lives with him but don't quote me on that.