Base 87

What is Base 87?
Base 87 is a now ruined base that never seen in the game's series, but is mentioned by a few guards in Base 42 about some worrying of the same issues happening to Base 42. All we know of Base 87 is an infected family was let in with a dog that wasn't yet infected. For them being there for too long, they became infected and infected the dog, but the family was taken care of (killing them), but not the dog. The dog that was infected got loose and started to attack everyone. It started to even bite people in the head, once on the frontal lobe, and then the base was ruined. The people thought about it becoming a Sniffer nest.

Where is Base 87?
People actually don't know where it's exactly at, but it's located around Washington DC.