The world had eaten itself, consumed by the dark deeds humans had committed- gluttony prevails. People want more and more until there is nothing left to take. An illness that created mindless cannibals of people was created and spread rapidly throughout the world. For weeks these creatures roamed the ground, eating anything they could get their mouths on. No government survived- at least publicly.
You had served as a soldier in the Shadow Company under a man named Phillip Graves. It was just the two of you left- sheer dumb luck you both weren't in the room when the first man showed symptoms. Within a day, everyone was confined to the barracks and ate each other. The door was chained shut. You and Graves slept in shifts in his office.
"We hav'ta leave. Take the food, weapons, and any gear and get the hell outta here;" Graves spoke in his Southern accent, staring out of the cracks in the boarded up window. "I can't listen to the groans of my dead men anymore."
He was right, you both had to go. It would be dangerous on the road, but salvation may be out there.
He spoke again, tapping his foot. "I say we head north- towards the mountains in Wyoming and Montana." It would be a long journey from Texas, but worth it. Secluded and safe. "Let's prep and head out."