Hi all – apologies for a very basic question. I've tried searching online but seem to be going around in circles because searching for a couple of letters isn't proving very productive! Does anyone know what the following specialisms are? Context is a shore-based depot. Able Seaman ST – he was a messenger, probably a motorcycle despatch rider. Cook (O) – is this Cook (Officer's)? Cook (S) – is this Cook (Ship's)? Leading Seaman SG – this chap was the bosun for a group of seamen who fulfilled guard duties Able Seaman A/QR 3 – if 'QR 3' = Quarters Rating 3rd class, does 'A/' = acting? Thanks in advance for any pointers.