UE8-14
From Halopedia, the Halo wiki
UE8-14 was a Scorpion Tank built by the UNSC. It had a painting of a hand depicting the "O.K." gesture on its left front tread cover.
In 2552, the tank was assigned to the UNSC In Amber Clad and was aboard it during The First Battle of Earth, but was apparently not used. However, when the In Amber Clad arrived at Installation 05, the tank was deployed to assist the Master Chief and the ODSTs in combating enemy Wraith tanks while searching for the Prophet of Regret just outside the Sentinel Wall. The Chief used the tank to destroy many enemy vehicles but eventually had to leave it behind when they arrived at a set of ruins where it was too narrow for the tank to continue[1].
Later, when the Arbiter was passing through the Quarantine Zone around the Installation's Library, UE8-14 was one of the Scorpion Tanks that had been captured by the Flood and was being used to attack Enforcers and Sentinel Majors, manned by a human Combat Form[2].
