Old Fella (#36).
"... What is wrong with calling Warrant Officer's "Sir" ? Out in the Colonies we were addressed as "Sir" or "Mr ........."
Here in the home country, a Warrant Officer would also be addressed as "Sir" by an airman, and as "Mister" by an officer.
goudie (#38),
Extract from my Post on "Pilot's Brevet" (page 194, #3874):
...it's amazing how much venom and dumb-insolence an experienced W.O. can put into a "Sir"...
(the whole Post is a good read, if I say so myself !)
As for the subject matter, my view is that you should learn to take Orders before learning to give them - simple.
Danny42C (even Older Fella).