ZombieMod takes a unique approach on the Zombie Apocalypse by putting it in the perspective of a military commander, not a survivor. Since it is 2 years after the first infections, resistance on the east coast is organized, resulting in battles rather than small groups fighting for survival.
here is my modified zombie file.
Larger zombie squad, reduced zombie squad price,faster, and much lower hitpoints
Survivor squad now has m1 carbines for better accuracy instead of grands.
Scout unit which is a fast one-man team lightly armed and low health.
this video shows the more realistic damage that normal squads can do to a zombie (once they're in range)