Muscatatuck Urban Training Center, the location for film, is used for disaster training by the military, police, firefighters, forensics teams and private groups in an ongoing basis. There were real military units conducting operations around and behind the production.
Weapons used by the human defenders include AR15s and M4s, AK47s, a French MAS36, an M1 Carbine, a Polish M44 carbine, a Peerless double barrel shotgun, a Remington 870 riot gun, a Mossberg 590 shotgun, Colt 1911s, Glock pistols, and a CZ52 pistol.