OK you Canadian experts...I know this is a really long-shot, but I wonder whether you can help me identify which ANS this might be?  The proud chap having just got his sergeants' stripes is Harry Callaghan, late of Manchester, England; posted to 29 OTU, 1660 HCU, No. 5 LFS then 467 squadron.  Harry and the rest of the Lancaster crew were killed on 3 March 45.  Any thoughts or clues, no matter how speculative, are appreciated.  At a guess, the dates when Harry was in Canada would be mid-1943 to Spring 1944, so would that limit it to No. 31 and 33 ANS?
Regards
Max