To expand on this, in Vietnam, individual soldiers were rotated in and out based on time in country, in WWII, units rotated as a unit, with replacements added during the rotation.
The fact that it took weeks or months to repatriate people back to CONUS after WWII, gave time for people to process their experiences with their brother in arms.
The way my grandfather talked about WWII was different than other folks I've heard talk about wars after. My grandfather was at peace about it within himself in a way I haven't seen since. The things he saw and had to do were no doubt just as horrific.
But for me as a reader of history, it's blindly obvious - in particular with the strategy used to treat PTSD, which is functionally group therapy with over vets with similar experiences.
IDK if Shay's book qualifies as "professional literature", but he was certainly a professional (VA psychiatrist), and I have the impression it was fairly influential.
[1] https://www.amazon.com/Achilles-Vietnam-Combat-Undoing-Chara...