THESE are the *real* Rules of War. Even countries currently in War like #russia or #ukraine or dozens of other places, generally follow these rules. When they don't, and the war is over and a treaty is signed – and often DURING the war itself, THESE are the laws their actions are judged by, from soldiers to commanders and everybody inbetween.
I suspect everybody who is currently in military in some form anywhere in the world, played #wargames as children. Kids today play war games and many will someday be in the military. But there is a lot more to war than aim, shoot, kill the bad guy.^