We're talking about mild. We had a national-level conference on the issue in April last year. Since then we have put decision support tools into Afghanistan, algorithms that help our people in the front line determine whether there is cause for concern.
You are right. I call it an association between traumatic brain injury and PTSD, and it's not hard to understand why that would be, because to have a mild traumatic brain injury, you've probably been pretty close to an explosion. That's the kind of significant stress that can also trigger PTSD, so it's really not surprising there is a close--