During the Second Battle of Requiem, Switchback was assigned to investigate a Covenant dig site. After Switchback discovered and reported the finding of a Harvester, they encountered heavy resistance and were in need of reinforcements. As they were the closest to switchback's location, Fireteam Crimson was assigned for the rescue mission. When Crimson arrived at their IFF coordinates Switch was nowhere to be found, only finding their IFF tags. Switchback would later be found and rescued by Crimson, but, according to Spartan Gale, Costabile had been killed by Covenant forces.