I think it is interesting that there is a high level of PD among vets. It may be politically incorrect to say this, but people serving in the military undergo stresses over and beyond anything that we experience in normal life, and are expected to get on with it, no matter how traumatic or shocking the experience, and sometimes only get treatment for mental/emotional stress way after the event. They also often also return to civilian life once the political need for military action has ceased, to a world that is no longer interested in the events that have played such a personal part in their individual lives, and had a profound impact on them. These things can be difficult to share with people who have not gone through them, and therefore they bottle things up, especially if they never receive any counselling. Seems like these are exactly the things to act as precursors to PD.......... it is not just about the chemicals, and the visible injuries.....