Jack Campbell is UAC Counselor Elliot Swann's trusted bodyguard and loyal henchman. He wields only one weapon which is the most powerful weapon in Doom 3: the BFG 9000. Jack is seen with Elliot Swann in some of the cutscenes, although during gameplay, the player gets a chance to watch him blast a group of Trites through a window using the BFG 9000 at very end of the Alpha Labs Sector 4, just before the first contact of the Vagary.