It is likely that the second initial in his regiment is a C, Royal Canadian Army Service Corps.That said, a search of the Canadian military archives, the Commonwealth War Graves Commission, Findagrave and Ancestry /FindMyPast turn up blank.Does his headstone have a date?You mention contacting the Canadian military. Was it the veterans affairs element which is the best place to go? http://www.veterans.gc.ca/eng/contactmaxD