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The Vault - Fallout Wiki
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Mobile base crawler
Fo3 Adams AFB Crawler Angle.pngFo3 Crawler Front.png
Fo3 Adams AFB Crawler Front.pngFo3 Adams AFB Crawler Side.png
Icon military.png
Different angles of the Enclave mobile base crawler
Mobile Base Crawler loc.png
World map: Adams Air Force Base
Part ofAdams Air Force Base
FactionsUnited States Space Administration (pre-War)
QuestsWho Dares Wins
Cell NameDLC03EnclaveBase01 (crawler)
DLC03EnclaveBase02 (p. base)
DLC03EnclaveTower (contr. tw.)
ref idxx000806 (crawler)
xx0011c3 (pl. base)
xx000805 (sat. contr. tw.)
Gametitle-FO3 BS.png
Gametitle-FO3 BS.png

The mobile base crawler is a massive military vehicle found in Adams Air Force Base.


An ancient, pre-War mobile satellite array/space shuttle launch platform carried by a crawler-transporter is the Enclave's backup command center on the East Coast. The massive vehicle was upgraded by the Enclave with newly developed technology, crafting it into a battle-station where the elite Enclave Squad Sigma trains, deathclaw experimentation continues, and access to Earth's remaining orbital payloads (like the Bradley-Hercules) are attempted.[1][2] The amount of technology is so staggering that it would take even a technologically capable organization many years to sift through all of it.[3]



The mobile base crawler is located on the eastern side of Adams Air Force Base. It's only accessible by a deployable ramp that must be lowered from within the air control tower.

Base floor

On the base floor, you will find Stiggs, an Enclave engineer who will help you if you let him live.[4] Also, if the alarm sounds, Enclave Squad Sigma appears. There is also a little room behind a repulsion field which contains materials and a workbench. Behind another repulsion field lies a room which contains several weapons, ammunition and armor.

The repulsion fields around the base can be turned off via nearby control panels. When these panels are activated, you can choose to:

  • Do nothing: nothing will happen
  • Turn off the repulsion field: requires a Science skill of 80, and will completely turn the field off.
  • Set a timed charge: requires an Explosives skill of 50, this will blow the panel up and partially disable the field. If you then walk through the field you will take minor damage. (Sometimes there will be a glitch to where you can't go through the force field).
  • Smash the control panel: this will destroy the panel, causing you to take damage and will partially disable the field. If you then walk through the field you will take damage.

Launch platform base

The second part is the launch platform base. This consists out of a deathclaw research facility, where you can find two deathclaws and the slo-burn flamer on a small platform where you can activate two repulsion fields. At the deathclaw research facility you can also find a security terminal where you can unlock all doors and a robot control terminal where you have the following options:

  • Perform safety shutdown: This will shut down all Enclave robots in the mobile base crawler.
  • Scramble robot targeting parameters: This will cause the robots to attack everybody, including you and the Enclave.
  • Run robotics diagnostic: This will tell you what the status of the robots is.
  • Target Enclave: Requires Robotics Expert. This will cause the robots in the mobile base crawler to attack the Enclave forces.

On the launch platform base you can also find the medical bay, where you can find several rooms with medical facilities, several toilets, the sleeping quarters, dining room and a kitchen. There is also a storage room directly below (down the stairs) from the door to the launch pad. Inside to the right are five missiles hidden in a bucket in the corner on top of a container. Lastly there is an armory and the armory master who guards it. There are several weapons with ammunition, including the precision Gatling laser on the armory master, and an alien blaster in a Hard locked-safe with alien power cells (some are found in average locked weapon crates).


Between the launch platform base and the satellite control tower, there is a transitional roof. On the roof, there are three landing pads for Vertibirds. Be careful; a Vertibird will set down several Enclave soldiers there. There are also two small huts with some ammunition. Also note that it's very useful if you hacked the robots with the terminal here, since there are about five sentry bots here.

Satellite control tower

The satellite control tower consists of three floors, which can be reached through a staircase or by walking up three different stairs. You can find some ammunition boxes here. On the third floor you can find a terminal which contains information about an Enclave scientist who hates it there; this terminal will also have a note saying that they have locked all the storage doors to keep in the malfunctioning robots (if you set them against their masters). There is also a terminal which allows you to unlock all doors. Here you can also find the satellite uplink terminal which allows you to control the orbital satellites. You can choose to fire on the following targets:

After you've chosen your target you can go outside where Sentinel Lyons will come to get you with a stolen Vertibird.

Notable loot

  • An alien blaster is in the launch platform base, in the armory which is guarded by the armory master.
  • The Precision Gatling laser is carried by the armory master.
  • The composite recon helmet is worn by the armory master.
  • A unique lab coat in the launch platform base is worn by the Enclave Doctor.
  • The Slo-burn flamer is in the launch platform base, in the southeast end inside a stasis field behind the sign labeled Sensitive Electronics.
  • Gum drops are in the launch platform base, found on a toilet in the top floor restrooms across from the dormitory.
  • Behind a crate in the southwest corner of the launch platform base area are some buckets holding a set of 13 perfect-condition combat knives.
  • A scoped .44 magnum is in the storage area of the launch pad platform next to a skeleton.
  • Nearly every weapon crafting component for every custom weapon can on the base floor (except for a radscorpion poison gland)

Related quest


  • After the end of Broken Steel (if you chose the good path and destroyed the crawler), Scribe Rothchild will inform you that the Brotherhood is reclaiming massive amounts of weapons and technology from the remains of the crawler and surrounding base.
  • After completing "Who Dares Wins", you will not be able to re-enter the mobile base crawler without using console commands.
  • There is a drum of Aqua Pura in the satellite control tower as well as a stack of drums beneath the stairs in the southwest corner of the launch platform base.
  • Amusingly, in two of the toilets in the base, there's a length of human intestine. Drinking from any of the toilets or sinks in any restroom has no rad penalty.
  • In a bathroom stall, a bloody garden gnome with glowing eyes was apparently cutting up meat with a deathclaw hand.
  • In the same washroom as the bloody garden gnome, there is a stall with an ashtray with two smoking cigars, a TV, a carton of cigarettes, stacks of pre-War money, a harmonica and an Enclave officer hat.
  • In between a counter with junk on top, there is a small gap where a garden gnome stands, in front of the gnome is a ball and farther in the gap, is a triangular pattern of milk bottles, which is obviously referencing bowling.
  • Behind a stack of crates on the level overlooking the deathclaw cages there is a small skeleton holding a teddybear. Around the skeleton are different things like bottles and food as well as a skate and a red baseball hat, this may point to at one point there was a child on the base that had died maybe of radiation poisoning as the only drink around it is one bottle of dirty water.
  • Comically if you have hacked the robot control terminal and set all the robots in the base against the Enclave, there will in an entry in a computer terminal in the same room with the computer you use to call down the orbital strike that says the robots are freaking out.
  • The robots of the Mobile base crawler run off of a modified V-29 Mainframe.[5]


The mobile base crawler appears in the Fallout 3 add-on Broken Steel.

Behind the scenes


  • PCIcon pc.png PlayStation 3Icon ps3.png Disabling the forcefield that blocks the player from reaching the slo-burn flamer by bashing it, and walking through while over encumbered may cause the player to take continuous damage, regardless of whether they are actually in contact with the field. This leads to a guaranteed death (and the player's body twitching after death, as if still taking damage). Being normally encumbered while going through the field appeared to solve this.
  • PlayStation 3Icon ps3.png Xbox 360Icon xbox360.png If you exit and re-enter the satellite tower from door on the top floor (leading to the landing pad) all the items on the bodies inside will respawn, you can repeat this over and over for infinite ammunition, Enclave armor, weapons etc. Exiting the tower from the bottom floor and re-entering sometimes causes the bodies to disappear; exiting and re-entering from the top again will restore the bodies.


  1. 1.0 1.1 Fallout 3 Official Game Guide Game of the Year Edition p.601: "BS 15.02.3 Adams Air Force Base
    A massive and sprawling base outside the D.C. Metro area, this is the Enclave’s new base of operations. They have co-opted a massive Space Shuttle Orbiter mobile platform and are using a huge satellite transmitter on top of it to send the signals to the orbital missile platform! After battling across a maze of hangars and forecourts, you reach the Crawler itself. Inside, the you encounter new elite Enclave units (the toughest ones yet) and battle to the nerve center of the place. You have two options to end this thrilling but dangerous romp."
    (Fallout 3 Game of the Year Edition Tour of the Capital Wasteland)
  2. Fallout 3 Official Game Guide Game of the Year Edition p.604: "AAFB 04: Mobile Base Crawler
    An ancient mobile satellite array that the Enclave have appropriated with newly developed technology, this is a battle-station where the elite Squad Sigma trains for battle, Deathclaw experimentations continue, and access to the earth's remaining orbital payloads are attempted."
    (Fallout 3 Game of the Year Edition Tour of the Capital Wasteland)
  3. The Lone Wanderer: "So, what happens to the Brotherhood now?"
    Reginald Rothchild: "I've been amazingly busy ever since we began clashing with the Enclave. All their technology is amazing. It's going to take me years to sift through the wreckage of their mobile platform alone. I suppose we have you to thank for that."
    (Reginald Rothchild's dialogue)
  4. The Lone Wanderer: "What type of defenses are upstairs?"
    Stiggs: "Well, just above us is a deathclaw research facility. Most of the deathclaws are out fighting, but there might be one or two left. There are also a bunch of robots in the facility, and they're all controlled through the mainframe. There are also some military types left but not nearly as many as there used to be."
    The Lone Wanderer: "How do I get to the Satellite Tower?"
    Stiggs: "Well, the Satellite Tower is right on top of the base. I'm sure you saw it before you came in. You're going to have to make it into the central control area before you get on top of the launch platform. Once you're on top of the platform, you're probably going to have to make your way past a bunch of soldiers before you get to the tower."
    (Stiggs' dialogue)
  5. The Lone Wanderer: "All of the robots are run off of a V-31 Mainframe?"
    Stiggs: "Huh. It's nice to finally meet someone who knows what the heck I'm talking about. It's actually a modified version of the V-29, but response/recall protocol is improved and the data transfer is much more secure. If you got into the mainframe, you could control all of the robots in the facility!"
    (Stiggs' dialogue)
Enclave Symbol (Fallout 3).png
Enclave Symbol (Fallout 3).png