The army and marines are dealing with PTSD head on, believing that what happened in Iraq and Afghanistan, will happen again, and now is the time to get ready. Experience so far has shown that PTSD can be delayed, perhaps for a long time. When a soldier does come down with it, PTSD can often be treated, and its effects reversed. But not always. This has large ramifications for non-military medicine, for many civilians suffer from PTSD. That's because military recruits are screened for their ability to handle stress and resist PTSD. In the civilian community, there are far more people who can acquire PTSD after exposure to much less stress. What many troops wish the brass would understand is that, as recruits, they learned that stress was a major part of the job, and understood it more than the mental health mafia is willing to admit.
For later reading.