From their website:
The Zombies are back, and The Paintball Park at Camp Pendleton needs your help. It’s year three, and this year we are calling all Zombie Hunters and fans to The Haunted Grounds at Camp Pendleton. Get equipped with top of the line zombie-hunting paintball gear and walk the haunted trails shooting zombies as you try and find an escape, Ride our gigantic Zombie Hunting moving trailer to eliminate from the hoard from above. Of course, there’s always a chance to play traditional paintball as well, we just added a Zombie twist for our Paintball Adventure.