Greasy.... lots I would imagine - me for example!
<<What they call NCO controllers in the RAF, I don't know, but they are just as qualified as officers for membership of GATCO...>>
Donkey's years ago NCOs were not allowed to carry out GCAs, as I understood. Result: I once saw a pimply-faced Pilot Officer talking-down jet traffic whilst a WO with about 30 years experience was carrying out mundane tasks. Hopefully things have changed now..