I think I know the answer to the question I'm about to ask, (bear with me please), but I'm not sure. Did any Commonwealth Countries, (other than Great Britain), use tanks in WWI?
This question not only covers the rhomboids, but the FT-17, Schneider and St. Chamond tanks.
I think the answer is no, but if possible, I would like it comfirmed.
There is movie footage of a bloke painting a maple leaf on a tank - I think it was a Supply tank called "Forage", but may be wrong about that. However, it suggests that at least some of the crew were Canadian, possibly the tank's commander. I'd dare to suggest that many crew members of many of the tanks were from the Dominions, although there were no specific Dominion battalions/companies.