Interestingly, if you look at the Canadian-specific literature, almost every study that talks about suicide does talk about PTSD. But you're exactly right, it isn't always related to PTSD. In fact, we know from our British colleagues that in Canada the number one mental health issue for people who have served in a combat role is depression, not post-traumatic stress disorder. The Americans tend to have more post-traumatic stress disorder and the Brits tend to evolve to binge drinking. I don't know if those are cultural differences or what.
There are a few studies looking at suicide. I think one of the issues is still getting the data harnessed in Canada. We have really good anecdotal data on suicide, but the large-scale studies are still not showing an increased rate in suicide in regular-force males. The studies show an increase in regular-force females over the general population for suicide and in the reserve force.