"War films not only show us the hell of war, but they also often explore themes such as survival, sacrifice, friendship and alliance, the effects of war on society, the traumas it causes, PTSD, and many other moral, political, and social issues.
Sometimes they're full of excitement and more heavy on the technical side in a way that they try to impress us with giving us thrills like "Dunkirk"; sometimes we just get to see human dramas like "Platoon," "The Deer Hunter" and "Casualties of War." There are also, of course, satirical/comedic approaches to the situations as well. As is obvious from the reception earned from films like "Dunkirk" and "1917," there are always many more stories to tell and many more other ways to tell them. Some countries even have their own traditional war films that make them stand out in world cinema."