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WAFU - Royal Navy eqv. to REME! Well some could say.
These are the nice chaps that fix the odd Lynx/Merlin/Sea King from time to time. Mainly found lounging in the hangar sipping tea and swapping dits of the night out before.
The term itself is an acronym of Wet and flaming useless. It applies to any member of the Fleet Air Arm.