My grandfather served in the U.S. Army in World War I. I don’t know if he returned with a touch of PTSD or not (it was called “shell shock” back then), but since he never talked about the war — and he was a great talker about everything else! — I knew that something about it still troubled him.
In World War II — when PTSD was called “battle fatigue” — hypnosis made some big strides. I have a copy of Dr. John Watkins’ Hypnotherapy of War Neuroses, which lays out his ground-breaking and highly successful work in 1944-1945 helping soldiers and veterans recover, preparing them for civilian lives.
The state of the art has advanced considerably since then, and modern hypnotherapy is better than ever. Sadly, though respectable in medical and mental health circles, hypnotherapy (“hypnosis with all the trimmings”) is unknown territory for most people in the field, in spite of its long history of supporting veterans who returned with PTSD, and other issues.