Zombie Apocalypse

As Daryl Dixon has expertly proven on the Walking Dead, a crossbow may well be the weapon of choice in the zombie apocalypse.  Arrows / bolts pierce the skull, destroying the brain and rendering the walker lifeless (for the second time).  The crossbow is silent, meaning other walkers are not cognizant of the threat.  Finally, once yanked out (and cleaned by wiping on pants) the arrow can be re-used.  Nothing like being green at world's end.

I want these two archers on my side when the undead come a-knocking.