There are a lot of movies in the 50s and 60s that werent so much war propaganda as they were soldier’s experience. Since their audience was people who’d been through war already. You see a certain style of humor of soldiers not heroically leaping into battle, but desperatwly trying to avoid fighting entirely, and when their is fighting trying as hard as they can to survive more than amything else. Certainly there were propaganda films then that did treat soldiers as heroes, also fuck john wayne, but its in the 70s and 80s that those types of movies disappeared and all war movies became heroic, and even non-war action movies became pro-war.