As to the evolution of mental illness, we know there has been mental illness throughout the ages. There is the old saying that you're perfectly ready for the last war. Right now we've been analyzing this insurgency/counter-insurgency battle, how it happens in small groups without the formed units, what impact that has psychologically.
There is also the undeniable impact of physical injuries, such as concussions and the interaction between concussions and these things, so each mission tends to be different in the sense that we've gone.... And I've been around long enough to go to the massive humanitarian crises and peacekeeping missions, which have unique stressors—the inability to act sometimes and to prevent things that are happening in front of your eyes—to out and out war.
Each has a different, distinct flavour. There was the “peacekeeper syndrome”, the rage that people felt sometimes in the peacekeeping era. There was the hopelessness, the helplessness, that a Rwanda can bring out in people, and with Afghanistan we're seeing a mixture of both. We're seeing sometimes the classic PTSD with the anger, but we're also seeing the guilt, the shame and especially protracted grief because of the combat deaths that we have seen at a frequency that we, as Canadians, are not used to seeing.
I'm not sure if that answers your question.
I always talk about having these large studies that you are alluding to. My colleagues have done them and I love these studies, but at the end of the day, a person is sitting across from you who is suffering and you have to address their experience.
We try not to assume what somebody is going to experience, but we do understand the unique qualities of asymmetric warfare. The enemy, in the case of the Taliban, almost had a mystique to them in the sense that all of a sudden they were there.
The grief and loss of losing loved ones, colleagues, comrades is certainly part of it there.