"Private Maurice Richard (right), Canadian Provost Corps, talking with students of the Khaki University of Canada, who ride in a jeep driven by Lance-Bombardier R.S. Hughes, Leavesden, England, 15 April 1946" (
source )
Look at the picture below. Although it looks like a bog standard jeep, it has been fitted with what we tend to call a CMP mirror. I assume this was probably due to the fact that for the Canadian military these rectangular mirrors were more plentiful in the supply system than the round US ones?