[ThermoNuclearWarrior]

I have loved zombie movies ever since I was a kid, but even as a kid I always thought the plots were unrealistic even in a world where zombies existed. They were so damn slow and easy to kill I don't think the military would have much trouble with them. How could zombies cause more trouble than intelligent people with weapons who the military is trained to fight?

[dynachrome]

“28 Days Later” gave the fast zombie scenario.

Good movie.

[Titus Quinctius Cincinnatus]

How could zombies cause more trouble than intelligent people with weapons who the military is trained to fight?

Yeah, well, that's what we all thought before the Battle of Yonkers....

[Little Ray]

Well its silly, but:

1. Infectious - their numbers increase with every victim. Even the wounded are potential zombies. This also means that zombies always have quantitative superiority.
2. Undead - things that would kill or disable a human being would hardly even slow down a zombie. Hitting a zombie with a flame thrower just gives you a flaming zombie. The only things that work are massive head trauma and dismemberment.
3. Persistence - they don't stop attacking day or night. They never rest. They never run away. You can't reason or negotiate with them.
4. Morale - Zombies - ick! Dead friends attacking you - eek! Also, a fear of infection. Having to kill your own wounded with a head shot to prevent more zombies would be a big morale hit, too.

That said, the solution is actually pretty easy - armored vehicles, especially bulldozers. The zombies can't hurt the AFV, and it can grind ‘em up wholesale. The only limitation is the amount of petrol and diesel available to keep them running.