During my visits to Lyneham over the years I knew of an airman who went from Cpl to F/Sgt without moving from the station, the added complication was that his surname was Sergeant lead to some interesting complications over the years I knew him! We also had a Herc G/E commissioned who had had a fairly lively social life over the years as a G/E and was rather put out to find out some years later, when he returned as O/C Eng H/Q Flight, under whose remit the G/Es lived, that a number of us who had worked alongside him were still doing the job so his exploits were still there in the " do you remember when" story mode!