File:Sergeant drill.gif This incarnation of the Bull Drill was built by Allen O'Neil in order to defeat the Regular Army, and became available in the Extra Ops titled "Tough & Cool". It primarily attacks by tossing three large boulders towards enemies, dealing large amounts of damage. Its special is different from its original counterpart, instead drilling into foes, rather than causing a cave in as the original does. If File:MSA Skill small +.png 4 is unlocked, Allen will drive the machine forward in order to impale more enemies.