Template:Human Character Infobox Private Walker is the Heavy Weapons Specialist of Corporal Harland's unit. However, after the encounter with the Hunters, which killed most of the unit including CO Lieutenant McCasky, and fleeing a fight with a small unit of Grunts, Walker was frozen with fear and had a mental breakdown. Walker's breakdown nearly cost his squad their entire lives had Private Cochran not taken the initiative to shoot down the Banshees. Walker's breakdown slowly vanished upon returning to H.Q. at the city Cote d'Azur.