Adding zombies, ala DayZ, isn't the only way you can mod military shooter ArmA. You can also do the awesome thing, and add dinosaurs.
This clip is an animation test that McRuppertle is working on, with the ultimate aim of adding an enormous Tyrannosaurus to the game world.
Anyone who has played Far Cry 3: Blood Dragon, or even Jurassic Park on the SNES, will know that if correctly implemented this will represent the pinnacle of modern game design.
Arma 3 - Trex Animation Test [YouTube]