PTSD is common amongst soldiers, but it is far from a soldier's disease. It hits lots of people far away from any hint of a battlefield. Train drivers suffer it (they may witness many suicides). Doctors suffer it. Some types may even suffer it at a higher rate than soldiers (pediatric oncology).

If there is a physical injury that results in similar symptoms, then that syndrome should probably be given a different name in order that it be separated from the wider disease that seems to have no physical trigger.