Lieutenant SPARTAN-B312 was a SPARTAN-III who served as a member of NOBLE Team in 2552 under the call sign "Noble Six". Deemed nearly equal in ability to the famous MCPO John-117, B312 was deployed as a "lone wolf" assassin, performing black ops missions that the more publicized SPARTAN-IIs would never be seen doing. After years of counter-terrorism, B312 was exchanged to NOBLE Team just as humanity's most devastating loss, the Fall of Reach, began.