The tank was assigned to the UNSC In Amber Clad in 2552. That year, when the ship was at Installation 05, the tank was brought to the Library in a Pelican while Commander Miranda Keyes and Sergeant Johnson searched for the Index. The Marines manning it were either killed or infected, as the tank was under the control of a Flood Combat Form by the time the Arbiter got to it. It was being used to attack Sentinel Majors and Enforcers by the downed factory within the Quarantine Zone.