Wellsley

Wellsley was a Class-C Military A.I. who helped Major Antonio Silva and First Lieutenant Melissa McKay setup and operate the Alpha Base on Installation 04. He was consumed in the destruction of the Truth and Reconciliation.

Biography
As with all A.I.s, Wellsley had the ability to choose his appearance. He chose to appear as a stern-looking man with long hair, a prominent nose, and a collared coat, and so resembled his namesake, Arthur Wellesley, the Duke of Wellington. Wellsley was created to act as a military assistant. He often referred to his victories as though he were the actual Duke and not an artificial re-creation, which annoyed many of his acquaintances.

It is possible, though unconfirmed, that he was the other A.I for the. Lieutenant Hikowa mentioned Wellsley as being for "point defense." A factor against this would be that he was already in Major Silva's HEV (Human Entry Vehicle) when he arrived. It is also possible that "his" purpose as a second AI would be to guide Marine Forces whilst Cortana would guide the Spartans and fighter craft. He is presumed destroyed when the Truth and Reconciliation crashed onto the surface of Installation 04. If not, he was almost certainly destroyed along with any possible survivors when the Pillar of Autumn's engines went critical, destroying the ring.