Terrance Brooks was a CIA special agent who served in only one operation known as WMD. He was having an affair with Dr. Adrienne Smith, shown by several e-mails that can found under the terminal. The password to access his account is "TBROOKS".
After the zombie outbreak in Laos, Alex Mason, Frank Woods, Joseph Bowman, and Jason Hudson return to the US carrying documents that hold the supposed facility where the zombies were created and studied. The CIA briefs Brooks, Hudson, Grigori Weaver, and Bruce Harris about the next mission to destroy the facility. When the four arrive, they are almost immediately attacked by zombies. During the fighting, Harris is killed. During the escape, Brooks is caught off gaurd, and mauled by several zombies. Hudson and Weaver are forced to leave him behind. Brooks' body is never recovered and the facility was never fully destroyed.