I agree with Crab on this. I was taught at Valley yonks ago when SAR winching was part of the helicopter conversion. It served me well during my RAF time both winching over the sea and through trees and underslung work. When I entered civvy street there was a mix of ex RAF and FAA winchmen. The so called Navy conning was not up to the same standard and had too many long silences especially on one occassion when we were inserting a diesel engine back into a platform crane's engine bay.
In the Solomon Islands the Oz crewman we had were ex RAN but were trained the Air Force way. In China the Chinese winch operaters we had worked well until something went wrong, in which case it was now the captain's responsibility.