Lapel badge: recognize it?

[Glen]

Hi again, I think we're getting closer here, but here's some more info to put the lapel badge in context.

My grandfather was trained at Camp Borden, then went to the Officer's Training Camp in Brockville. The pictures I'm going to upload now are all from when he was still in Canada, so I'm thinking the picture of him in Aldershot with the Ontario Regiment capbadge (with arched cat etc..) together with the mysterious lapel badge was such that maybe he hadn't yet received the lapel badges for the Ontario regiment?

In any case, the first picture is of three officers, my grandfather's on the right. Maybe the armbadges they have in these pictures are a clue...they all have the same tank logo. I know the guy in the middle and my grandfather both trained at OTC brockville, so maybe the armbadge is from there?

Also, the guy in the middle looks like he as already been assigned to a specific regiment, given his capbadge ( is that the sherbrooke fusiliers or the halifax rifles or something?)

Anyway, I've posted a closeup of the tank armbadge, as well as a closeup of my grandfather's cap badge while still in canada which looks similar to the lapel badge I'm trying to pinpoint.

I looked on the websites you all suggested. I'm thinking it's not the Royal Tank Regiment, since the guy on the left in the 3-officer photo seems to be sporting the same lapel badge that I'm trying to pinpoint, as well as cap badge, and the picture was taken in Canada.

I went to the Royal Canadian Armoured Corps website and the badges there look maybe to be what I'm looking for.
I'm thinking maybe the one that says "school" is the one I'm looking for, since the mystery lapel badge surface in the original picture I uploaded seems smooth, not covered in rivets like the other one, and it makes sense that they would wear a badge that was for a school if they were, in fact, being schooled at OTC Brockville.

But, the badge ("School CAC ")on the RCAC site...
http://www.rcaca.org/En/indexLM.asp?ID=1
...also seems like it could be the one I"m looking for because of the placement of the gun on the side of the tank and how it's big and squarish, and there's a big blurry square on the original photo I provided in this thread.

What do you think? Am I whistlin' Dixie here?
Cheers,
Glen.