Thirty thousand Canadians fought in Vietnam, even though that nation never entered the war. They came to the United States specifically to do so with 110 dying in the war and seven being listed as missing in action.
One of them, Peter C. Lemon, was awarded the Medal of Honor.
Canadians fought in Vietnam William Lawrence Sr Omnibit 5-25-20
The link goes to an interesting Canadian news website. Nice to step outside the echo chamber and check out foreign perspectives now and then!