Originally Posted by
Kitbag
Service numbers used to be batched, I'm an ex Technician Apprentice and all of us (unless we remustered) were '815's from the early 70's until the scheme ceased in the 90's. It used to be possible to work out peoples base trade from their service number, sadly lost when the new system was introduced.
Except that some Tech Apps in the late 70's were 8019 and 8020