Armory A-01

 was an United Nations Space Command armory and armor testing facility aboard Cairo Station occupied by Master Sergeant Gunns. During the First Battle of Earth, Covenant boarders invaded. Stealth Elites armed with Plasma Rifles killed the Master Sergeant, who was equipped with a shotgun. SPARTAN-117, from Hangar A-02, moved too slowly to save the UNSC soldier, but was able to avenge him.