Margaret-053

Black-One (name and Spartan tag unknown) is a SPARTAN-II Commando of the UNSC Naval Special Warfare Command and the leader of Team Black. Her visor is etched with the Roman numeral "I".

Conscription
She was abducted and conscripted into the SPARTAN-II program by Dr. Catherine Halsey in 2517 when she was six years old. She was then taken to the planet Reach, and trained by the AI Déjà and Chief Petty Officer Mendez, along with the rest of the Spartan children. She was assigned as the leader of Team Black, and trained with the other teams such as the Red Team. In 2525, she and the other candidates underwent a series of augmentations to improve their abilities. Black-One was among the ones that survived and were not crippled or killed by the procedure.

Later Career
During the Human-Covenant War, Black-One served in the Battle of Verge and a mission on an Unnamed Moon.