And you base this off of what, exactly? Hell, you're even declaring without knowing that only that one I know for sure was infantry is the only one who was. See what I mean? You keep grasping at straws.
Tell you what, one of them in particular bragged about being in infantry, which he used constantly to argue against gun rights well before he came out being in support of antifa.
And yet I know quite a few antifa types who are also veterans. So I'm going to guess there's a fair number of them who just aren't openly talking about it.