Fire Team Sigma is Detachment 1 of UNSC Spec Ops Team 4. Fire Team Sigma is lead by Neal, Spartan 119. Accompanying him are hell jumper Captain Warren Tomac and marine Lt. Adam Thompson. Spartan 119 has been leading various assaults on Spectrum City to wipe it clean of the Flood infestation after the Covenant Invasion. The need for a more organized, but compact fire team was suggested by HighCom in order to strike more efficiently against the enemy. Spartan III's were suited candidates to fight, but Spartan 119 along with a handful of other Spartan IIIs are the only ones left to fight with the remaining marines.