stress disorder, oftentimes what you find is people who have a heightened sense of danger in and reaction to danger. what in essence they do is that they strike out or have plans to defend themselves in situations that ordinary are not dangerous situations. it is not uncommon to see individuals, especially those trained with weapons, to overreact in a way where they employ those weapons against enemies who aren't really enemies. where they overreact or overestimate the risk of that person's intent toward them. >> this is a horrible tragedy. if it was linked to ptsdf we're able to ever know that, we have all of these troops coming home. are they being diagnosed and treated or do we have the potential for a lot of people with, whether minor or major cases of this, who are just going to at the least lead very stressful and unhappy lives because they're not able to get treated? >> it's a great question because many of the people returning from the war, the soldiers returning from the iraq wars,