V1 was a combat robot that was built by the United States for taking down the Japanese THR-1000 Earthmovers during the final war. (the final war is basically if WW1 never ended) After the war and extinction for humanity. V1 went to the moon to search for blood because he was dehydrated. there, he stumbled across hell. So v1 just went on a rampage into hell to keep a decent amount of fuel in him.