Before helicopter crewmen became a 'respectable' trade, first by redeploying surplus air signallers and then others before AQMs, the job of crewman used to be undertaken by ground crew. The advent of the Wessex and Belvedere made the task supposedly more complicated.
I have, I believe, possibly the dubious privilege of being the last member of ground crew to do the helicopter crewman training at Tern Hill - a one week course crammed in to two!!
Can I come to the service????
O-D