Fassbender was a soldier who participated in Operation Shear.
Under the command of Lieutenant Childress in the 24th SAS Regiment's H-Squadron, Fassbender was assigned under Lt. Childress's group which had been tasked destroying the mortar positions. Having survived the initial storming of the Sentry Guns, Fassbender was amongst the few soldiers who had infiltrated the Chimeran positions alongside Sgt. Nathan Hale. Charging up the hill, a nearby Sentry Gun had began pinning down Hale's unit, and upon realizing that Hale needed to destroy the mortar position, Lt. Childress ordered Fassbender to lay down suppressive fire on a Sentry Gun nest in order to protect Hale. Unfortunately, Fassbender and the remainders of his unit died whilst attempting to complete the objective, leaving Hale to destroy the mortar positions alone.