spusa Would have kicked off as an LAC after training and would probably have made SAC if he'd kept his nose clean and was good at his trade.
After training as a Boy Entrant from Sep 63 to Apr 65 I graduated as an LAC but qualified to SAC; a rank to which I was promoted after 6 months satisfactory service. After that I was promoted to Corporal in 1974!! - the promotion system was pretty much clogged up. However, after 2 years I then became a Flying Officer and onwards and upwards at a much faster rate!