I think it's likely he's a Navy MA - a relatively new rating which signifies 'master-at-arms'. In other words, a Navy ship-board cop. Once upon a time (i.e., back in my day) 'MAA's were typically pulled from the deck ratings (Bos'n, Gunner's mate, etc.) for temporary duty as MAA. We called them 'hall-monitors' behind their back - but not so's one of them could hear you; they could make life hell for you in a NY minute.
Thanks for the feedback.
We have had threads in the past re the MAAs.
The Navy has changed with the times and still functions great!