Right I have found a current copy of the QR&O... but it doesn't inculde past stricken ammendments.
Link to the QR&O:
http://www.admfincs.forces.gc.ca/adm...l2/intro_e.asp
Might be a little difficult to read - because of the joint French/English printing of legal language... but hey it's what I deal with (I still can't speak or really read French).
Here is a link discussing numbers and citizenship - taken from a Vietnam veteran's website:
http://www.mystae.com/reflections/vietnam/canada.html
But you'll note that even they mention having trouble determining the disposition of Canadians as the records are retired or closed.
I'll keep looking for direct references - legally speaking - to the disposition of Canadian citizens and soldiers that served with the US military during Vietnam.