Jim served at one of the military bases of his country. As if a plane carrying chemical weapons crashed near it. Almost all civilians living nearby in the cities were exposed to the virus and turned into zombies. But some people survived and managed to get to the base. Now you in the game Defense of the Base will protect them from hordes of monsters who continuously attack the base. Your character will be armed with a standard ammunition. Monsters will penetrate through the perimeter and you pointing at them the sight of your weapons will have to fire on them to defeat. Try to shoot at the head to kill them quickly.