We had two airmen aircrew student navs in 1961. One, at least, was ex-AEOp, Brian Wiggins. I think he went back to the kipper fleet. The other, Bill Cairns, completed the nav school and then was given a commission. As he had been through the whole nav school process, I am not sure what else he did, but I think it was a quick conversion.
I think the first RAF pilot I met, at least the first I met who was in uniform, was a Corporal. A Corporal Steward serving lunch in the Officers' Mess at RAF Silloth. I won't say when