Overlord support me in this Pongos at six `oclock...tally ho
Well if I had realised that this message board was home to petty service banter and ill-informed abuse of the RN and British Army I would have joined up long ago!
Perhaps, JollyBob, you are looking for a Master at Arms who was a cross between an RSM and a senior Military Policeman. This link:
http://www.rba93.com/history.htmalso suggests that he had responsibilities for weapons training for the ships company so might well have been a key man in a landing party.