From Halopedia, the Halo wiki
UE8-14 was a specialized M808B Scorpion tank in service with the UNSC Marine Corps. The tank was designed for medium-armor warfare, featuring thinner armor, making it lighter than the standard M808B. As well as its modifications, the tank was an olive green color, and had a painting of a hand depicting the "O.K." gesture on its front left tread cover.
In 2552, UE8-14 was assigned to the UNSC In Amber Clad and was aboard it during the Battle of Earth. In November of that year, when the In Amber Clad arrived at Installation 05, the tank was deployed to assist John-117 and a group of ODSTs in combating Covenant forces while searching for the Prophet of Regret outside the Sentinel Wall. The Chief used the tank to destroy multiple enemy Type-32 Ghosts and Type-26 Wraiths but he eventually had to leave it behind when arriving at a set of ruins too narrow for the tank to continue.
Later, when the Arbiter Thel 'Vadamee 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 Sentinels, manned by a human combat form.
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