No, you have to have Canadian citizenship I believe, so if you gain Canadian citizenship you can, but it may take awhile as they do a minimum 10 yr background check. I know a woman who lived in...
There was a time when a person from any country could become a US citizen by serving in the US military. I don't know if this is still true or not. Check the web sites for the Army, Navy, and Air...
The British Armed Forces accept citizens of all Commonwealth nations (whether a Dominion, or just in the Commonwealth of Nations), as well as citizens of nations who may no longer be in the...