Steven-A231, born Steven Neeson, was a Spartan-III super soldier during the Human-Covenant War and Post War Era. He was known for being the second-in-command and sniper of Alpha Team of the Alpha-Zulu Corps and close friend to Roderick-A207. He was a major player during the Vixel Rebellion where he would met his end by general Thomas Montesquieu in 2566.