There’s another fine film called “Captain Newman, M.D.” which starred Gregory Peck as a shrink dealing with “shell-shocked” vets. So there was some acknowledgement of psychiatric problems after WWII. And the British attempted to treat shell shocked victims during WWI - well, when they were not executing soldiers for cowardice, lol.
Someone posted recently that we shouldn’t talk about Post-Traumatic Stress “Disorder,” but simply about Post-Traumatic Stress, because effects of some kind are the norm, rather than the exception.