Talshere said:
While I agree they are not immune to structural damage, even the outright severing of a muscle wouldn't stop them.
It doesn't have to. Simply disable them to the point where they're an easy target to roll over with a tank, or cook with a flamethrower, or smash into oblivion with a rifle butt. Crawling and determined zombies are still mindless, easy targets; even easier targets than they were standing up. Even in the (again vanishingly unlikely) event that such mindless wrecks could manage to infect a population the size of New York City, yes, between armor, artillery, air and infantry the outcome of this confrontation
is guaranteed. Almost absolutely guaranteed. That's why Brooks had to jury-rig the contest with improbable behavior on the part of the Army and its soldiers.