I don't recall a cmsf wwII mod. If it was done, it was probably done poorly, no offense to the author of said mod. Hard to make modern assault rifles and armor act like WWII era weaponry when you have zero access to the models are the statistical information that drive them. Play some red v red, it's the closest we're going to get for now unfortunately.
Or reload CMBO. Thought about that myself for two seconds.