I think it's very important to understand, as you're saying, that with a higher level of exposure to combat and the witnessing of atrocities, there seems to be a “dose” response relationship. If you had a peacekeeping mission in which the soldier didn't see much combat or didn't observe any atrocities, he or she would not have as much of a risk. So you're absolutely right.
The risk usually can be over time. I think, again, awareness by the soldiers and the family members around them and the post-deployment screenings are trying to get at following people after they come back from Afghanistan. Those are ways people can take the highest-risk people and get them into care.