Hm! I’d check out some of the actors in the tv show “Generation Kill”, particularly Rudy Reyes. He’s a decent looking actor, and he actually played himself in that show so there’s lots of military photos of him.
Also check out movies such as “Jarhead”, or actors on TV shows like NCIS. I’m not sure of any models that have the “military” look, but if anyone else knows please give me a holler!