Nothing to do with "the old school tie" of course!
Danny your last: "When you finished our SFTS, you just got your A/PO or a Sgts' stripes (acccording to their taste)".
The figures for Dad's Course 12 at Clewiston were these;
83 RAF Cadets started, 9 washed-out, 2 were killed in training, 57 graduated as NCOs and 15 as Officers.
17 USAAC Cadets started, 1 washed-out, 16 graduated (all as officers with US silver wings, pinned left side, and the RAF wings, right side).
Ian BB (or as you prefer B-B)