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.
The SWAT sniper is a lone hunter. He has no spotter to spot for him. Also, the SWAT sniper cannot shoot as far or accurately as National Guard snipers. However, the SWAT sniper can move faster and can sprint if necessary. In addition, he can infiltrate onto the map through buildings. Useful in combat ;)