This thread has been puzzling me because while I would automatically defer to 54Bty on most things Gunnery something was niggling at me. This afternoon i remembered where my 1968 YOs notebook was and had a look. And there it is under a heading Gunnery Staff: IG - officer - red SD hat band on exercise; Master Gunner - WO1 - white SD cap cover; Ack IG - WO2 -ditto.
Inconclusive I know.
I am not sure when Ack IG changed to SMIG, but it seems to me it would have been mid to late 70s.
Eddie
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