Yes, I am very old, but not, after checking, old enough to have been an AC2, so you are correct. AC1 and AC2 were combined in 1964 (April fool’s day, as usual), so I was 4 years out.
Memory is a strange thing and my RAF Record of Service seems to have disappeared through a wormhole in the spacetime continuum, or the back of the filing cabinet (probably the same place as my 3822). Perhaps it was the TAG bit that set me at the bottom of the Air Force pile.
Please remove all reference to “2” and I shall bask in the promotion to AC Retd (but still not use it)