The composer Maurice Ravel was a lorry driver during WW1, and wrote these pieces during the war. Each movement is made in memory of a dead friend.

https://www.youtube.com/watch?v=Wz165MCij6c

Crazy picture on the YouTube video, but I once met a Norwegian professional soldier on a pub who had also worked as a jazz pianist. He was a scout in Afghanistan, and I had a most interesting conversation with him for almost two hours, I think. I could see the brutality in him which is probably needed to be trained to kill other people, but it was very much restrained by a professional attitude. He talked about not provoking in a tense situation, for instance through how you held your weapon. He also said something like “the last thing you do is shoot”.

Other than his profession, which I found kind of strange, I liked the guy and enjoyed talking to him.

Anyway, better to work for peace than plan for war.