I've never known a police officer to go into a building and go "Hello I'm a policeman" like that. Is he a real police officer? I'm guessing it is meant to be.
He obviously does speak so highly of the ex-solider who can't be anything but a PE teacher.
I'm not sure I like the fact that he seems to be a babbling idiot. Matt might have been eccentric but he could play eccentric he didn't sound like a fool in my opinion.