[Bonnevie]

one reason it may seem you hear more about it since Vietnam and the Middle East wars is how they were fought. In these wars, there was no sense of "safety" being "behind the lines". It is often not possible to know who was threat. so the "fight or flight" response was always on, flooding the body and mind with adrenaline. So always in constant stress. As for other wars, as others said, my mother said my father was never the same...he certainly had the anger part.