“A good number of Canadians defied their Government in joining the US military during the Vietnam war. I don’t believe the Canadian government retaliated against them. “
By coincidence, a good number of Americans defied their government in joining Canada during the Vietnam War. Carter made them feel all better later.
To restore our faith in mankind, I picked up a book in Toronto many years ago that stated that more Canadians came across the border to fight then Americans going the other way. Recruiting stations around Plattsburgh even had signs in French.