My brother in law rides for the Boozefighters MC down here in Corpus and I know they have a chapter up in the SA area. Good guys, quite a few I've met we're vets and damn can they throw a party lol. If I remember correctly their motto is "1-family, 2-job, 3-club"
If you're just looking to ride and wanna be around vets you might also look up the local Patriot Guard Riders.