"I'm not really good at asking, I'm more suited for discussions at muzzle velocity." - Sean-140 Sean-140 is a SPARTAN-II Commando of the UNSC Naval Special Warfare Command. He is the squad leader of SPARTAN Team Silver and goes by the call sign Silver One. He has fought in many conflicts with both the Insurrectionists in the Covenant. During the final months of the Human-Covenant War, he fought in the Battle of Reach, Battle of Diamond and in the First and Second Battles of Prime. During this time he was paired with the AI called Hera. Sean and two other members of his team are among the few surviving Spartan-II’s.