Again, this question would be better directed to the Department of National Defence, but I do know they screen in their recruitment phase, both physically and psychologically, and they screen before and after deployments. But you would need to ask the Canadian Forces themselves the details of that. Part of the role is to be able to build that resilience so individuals are able to deal with what they're going to encounter in missions.
On April 29th, 2009. See this statement in context.