[Zomboid]

Haven't played it, but it sounds fun. I prefer WWII settings to any other war settings. It's just got the most interesting locales, IMO. A vietnam game would be boring as fuck cause it would just be a lot of hiding in jungles and rice paddies. WWI might be fun but there's less diversity in guns and I get the feeling that there'd be a lot of running from mustard gas and hiding in trenches (if it were the least bit accurate). Stuffing wads of urine soaked cotton up your nose would be an interesting gameplay concept though, I guess.