Wasn't Canada considered part of the British Empire at the time? Canadians, Aussies, and others, fought under the flag of the British Empire all during WW-II. Acts of Independence (sorry if I'm using the wrong term) came later, I believe. Lithgow also counted as a British arsenal, as well. I regret any offense given residents of any of the
former dominions, colonies, protectorates, and so on.
Best,
Johnny