Again, that's a difficult question, and it's outside my realm of expertise.
What is clear, however, is that if we look specifically at post-traumatic stress disorder, we know that certain individuals are susceptible to this disorder and others are not. That susceptibility is actually a biologically anchored event. In other words, we know that about 20% to 25% of people who will be exposed to combat stress will develop some form of post-traumatic stress disorder. As you know, for some it will be fairly short-lived and for others it will be for a very long period of time.
It is clear that certain individuals are more susceptible than others to developing this. My own belief, and it's really my own belief--again, I am not an expert on this topic--is that epigenetics and genetics studies will help us screen and identify the individuals who have an increased susceptibility to developing this type of disorder. As you know, it's a biological disorder. It's a truly anchored biological disorder. It's a link between the brain and the hormonal system and its imbalance in extinguishing the fear.
The first important thing to do is to explain to people who experience this that it is a biological phenomenon, probably a protective phenomenon, and that they don't have to be ashamed of it. You have to listen to them. You have to explain that it actually is a biological mechanism. Their hormonal system isn't balanced and their neurotransmitter system in the brain isn't balanced.
We need to better understand what type of imbalance we're facing and how it is and why it is that in certain individuals the mechanisms that normally extinguish the fear once it has appeared, which is a purely biological phenomenon, don't work. Hopefully, we'll eventually be able to screen these individuals, and either have a mechanism to protect them from that or just not send them into combat.