Sheila

Shelia is a tank working for the Blue Team with a violent and disruptive personality. On her first mission with the blues, some modifications by Church turned on friendly fire, and right afterwards Sheila, manned by Caboose, accidentally blew up Church.

Later, Sheila went into shutdown while both of the teams went into a teleporter to Sidewinder, which eventually led to them blowing up the present. She then re-appeared in Halo 2.

Caboose began a close friendship with Sheila, making Caboose the distraction for anyone who wanted to mess with Sheila's command console.