This morning on Silver Screen Classics there was an NFB documentary called “Wasp Wings”. The film deals with the role of the Spitfire during the war, but towards the end there a numerous shots of RCAF CMPs and other vehicles belonging to the ground and support crews. They show close-ups of the marking on the RCAF vehicles. The link to the film on the NFB site is below.
http://www.nfb.ca/film/wasp_wings