Do all veterans have post traumatic stress disorder?

Most don't have PTSD: Most military personnel do not even serve in combat areas. And most of the ones who do, do not experience the kinds of traumatic situations that can lead to ptsd. And even of the small minority who *are* exposed to psychological trauma, not all go on to suffer ptsd. Getting ptsd appears to result from a combination of personality factors plus trauma exposure.

No: Veterans who do not see combat are at a lower risk of PTSD while, conversely, veterans who have seen combat at at a higher risk for PTSD.