The counter-zombie assault in the end of the book doesn't work in the movie because the book was the slow "derp" zombie variety vs. the zerg swarm zombies in this film. The "zombie camo" does allow them to use melee, though, because they won't attack sick hosts, thus humans can just wade in and own them (like that scene in the montage at the end of the film).Yes, super mystery zombie invisibility army is the same as worldwide organized manual defense with melee weapons.