I watched All Quiet on the Western Front, so you don't have to. Don't bother. It sucks. If you watch it and by the end, you say, that sucked, don't come crying to me.
It's a big long boring movie made to show you that war is bad, and that the Germans were pathetic, and to be pitied, and that war is an endless cycle. It is a movie without any joy or happiness or even a message beyond the trite. I kept waiting for the point but it never came, until the end, and when it did, it I was unsatisfying. I'm sure that was intentional, it was meant to make you feel like what war is like, but I already had figured that out so it was frustrating for me. What was most frustrating was that the films protagonist was a wimp. It was sad to watch, which was the point I guess.
Statistically speaking soldiers don't get ptsd from doing offensive missions, they get it from defensive missions. They don't get it from killing others, they get it from almost getting killed and seeing their friends get killed while pinned down.
There were several scenes were he cried after killing someone. Fucking bullshit. You want to see how a soldier reacts to their first kill watch this scene from Barry (HBO)
https://youtu.be/lylcHY6tXXQ