B-1 13-421

B-1 13-421 was a Jiralhanae (Brute) of the rank of Brute Minor.

He participated in the Battle of New Mombasa, where he killed over a dozen UNSC personnel. He was last seen at the top of the New Mombasa ridge shortly before SPARTAN-117 was captured.

B-1 13-421 wielded a Type-25 Carbine, and was notable for his loud and fear-inspiring animalistic cries.