Dabbers. This is the most common nick name for the Royal Navy's warfare trades. Where as warfare was origianl source branched into Sonar, Radar, Gunners and Intelligence it has now been turned into the OM's branch (Operator Mechanic).
You could and occasionlly still do find them listed under the trades of:
Also within their own jobs they will be found maintaining their ships, down the Ops Room, up on deck for Seamanship, or basically dossing off from anything else. However, the Royal Navy is still ever-changing and the OM's branch has now gone into 'Top Mast'.
They do have a fond tendancy to head towards the Diver's Store or the Buffer's Shack after a good night out. Use your imagination why!