Originally Posted by
Brian 48nav
Herod
I was going to say when I joined at South Cerney in Dec' 65 IIRC I was given a 4232*** number followed by a suffix letter which disappeared on commissioning, but Barksdale Boy beat me to it in post No. 60.
Brian the letter didnt disappear, it appeared at a guess around 65-66 with airmen having a prefix and officers a suffix. It was a checksum letter with computerisation. There is a detailed explanation and decode on Pprune some years back.
I remember some resistance to using the letter. When that crumbled we delighted in answering 'last three ' with '34a' 'no I mean last 3 numbers '