Hi Dave:
In Canadian (and Commonwealth service) the anti-tank, anti-aircraft, field, medium and garrison (coastal) artillery were all branches of the Royal Canadian Artillery. Badges and traditions were very similar but each branch had its idiocincracies.
I suggest you visit
http://www.canadiansoldiers.com/main.htm for the orbat and badges of the Canadian Army. Mike Dorosh (the website owner) has done a fantastic job gathering all the bits of info (including a whole section dedicated to vehicle markings) into one website.
Good luck!
Cheers, Mike