I don’t think the guy is military either. His posture suggests that he has not held a firearm too often.
As for the girl, this is probably the first time she’s ever held a gun in her hands.
the funniest part is actually their facial expressions. How should I put it... partly “OMG! I’m holding a gun”, and partly “man! I gotta look cool!”, and partly “man! Wait until I show this pic to my buddies!”