Rance Auerbach was a cavalry captain in the United States Army. He was of Southern descent, and had ancestors who had fought for the Confederacy during the "States' War". He served during the war against the Race. Originally based in the Northeastern United States, Captain Auerbach and his cavalry unit were assigned to escort General Leslie Groves to Denver with the plutonium captured from the Race in the Soviet Union. Once having delivered General Groves to Denver, Captain Auerbach's unit was assigned to eastern Colorado. There, he and his unit performed raiding missions against the Race, engaging their strongholds in western Kansas. In addition, Captain Auerbach's unit was responsible for stopping the rogue physicist Jens Larssen during his attempt to defect to the Race.