Mobile Base Crawler

The  is found at Adams Air Force Base in the Fallout 3 DLC pack Broken Steel.

Who Dares Wins
It is necessary to go inside the Enclave Mobile Base and launch an airstrike to complete Broken Steel as part of the last main quest of the DLC.

Appearances
The appears only in the Fallout 3 DLC Broken Steel.

Trivia
The Enclave Mobile Base concept seems to come from the Mobile Launcher Platform and Crawler-Transporter of the NASA, both very big vehicles used to ferry rockets and Space Shuttles.