Safewood

True, there could be infected marines with armors, that only slightly runs faster than regular infected, if any, though are armored. Then you have infected marines without armor, which will outrun you no matter what. I think there's nothing wrong with various types of zombies, since it only add more variety to the game, which can only be good. I actually made a list in notepad about various types of dangerous entities: Humanoid Zombie Types: 1.) Infected Civilians 2.) Infected Police 3.) Infected Marines Animal Types (Infected or not): 1.) Wild Boars 2.) Lynx 3.) Grey Wolves 4.) Brown Bears 5.) Amur Tigers Humans: 1.) Bandits 2.) HECU squads

What they should do is, have the Military Infected wear armor suits, so certain bullets doesn't penetrate and do insignificant damage on certain part of their body. Since soldiers are well fully trained, they should be able to outrun you aswell, and deal more damage than regular Infected. While they're in crawl stance, they can sometimes jump to the sides, so they makes it harder for you to put them down. Lastly, you could have HECU squads, which kills anyone on sight. That should prove to be a challenge.