Blood Harvest

Blood Harvest is a campaign. The Survivors must travel to a barricaded farmhouse and get rescued by the United States military. The escape vehicle is a United States military armored personnel carrier.

Official description
Zombies lurk behind every tree, over every hilltop and behind every shadow in this terrifying moonlit search for a rumored evacuation zone to the north: several acres of back-country farmland taken over by the military to get the last of humanity out of Ground Zero. Plunge through pitch-black forests, stumble blindly through fields of swaying corn, and take aim at the silhouettes leaping at you from the darkness—all towards finding a hold-out that might already have been abandoned to the horde.

Writings on the wall
In the saferooms, the writing on the wall is telling the remaining survivors to follow the train tracks to get evacuated to the safezone.