From what you say, I don't think that the fact that he enlisted in Ottawa will help determine the unit he was attached to. If you know the base (or town associated with the base) that, along with the date at the base, could lead to the squadrons based at a station.
I'm not sure whether the ground staff such as drivers were assigned to the squadron or to the station although the fitters were often assigned to a single aircraft which would lead to an association with a squadron for at least as long as it stayed at a single station.
About the 400 block for Canadian squadrons.... 12 Communications Flight from RCAF Ottawa (I was wrong to call it a squadron in the last message) did NOT/NOT become 412 Sqn on going overseas. 412 Sqn was formed in England 1941 flying Spitfires (one of their wartime pilots, Charley Fox, is now the Squadron's Honorary Colonel, a very pleasant gentleman and an engaging speaker). Postwar, the name of 412 sqn was resurrected and applied to 12 Comm Flt to become 412 Transport Sqn. 412 sqn is presently responsible for VIP political and military transport, medevac and military utility transport, based in Ottawa
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