Mao-B170—born Zhang Mao and later known by the nom de guerre of the Shooter—was a supersoldier trained under the UNSC Navy's top-secret and controversial SPARTAN-III program. A Beta Company graduate and inductee in the elite Headhunters division, he stood as one of the most-effective field assets employed by the Beta-5 Division during the Human-Covenant war, having accrued a 100% operational success record and a lethality rating comparable to few others over the course of his decade-long service.