In my opinion, the impact would be minimal, given the number of permanent residents who enlist in the Canadian Forces each year. You have to understand that we are talking about specific needs. We consider permanent residents who want to join the Canadian Forces when there is a specific need in a given military job. Take pilots, for example. The training can take more than two years, actually. People are recruited, their files are studied by the commander of the Canadian Forces Recruiting Group, who then decides whether employing such a person would or would not be prejudicial to national security.
On March 19th, 2013. See this statement in context.