Sheila was a

M808B Main Battle Tank. The Blue Team received the tank from command to use against the Reds. Because no one on the Blue Team was able to operate the tank, it was of no use to them. In the first series, Church and Tucker ran into the Reds' Warthog, where they hid behind a rock so as not to be shot by the chain gun on the back. Caboose sees that they are in trouble and gets into the tank. A tutorial initiates and Caboose drives the tank down to his fellow Blues. At first he drives around doing nothing, but then locks the main cannon on the Warthog and destroys it. As Church stands up and starts yelling at Caboose, the main cannon locks onto Church and kills him. Sheila later Develops A.I.