Who Dares Wins

 is a Fallout 3 quest and achievement that is added to the game in the Broken Steel downloadable content pack.

Walkthrough
Enter the small shack and hack the computer, turning off the turrets and make your way through to the air tower. Avoid the flamers along the way to save ammo call in an air attack on the vertibirds. You will also have to hack 2 more computers to shut down the second and third set of turrets. Continue your way through the Base until you arrive at a field with hangars to you right and left. The first one to your left has 4 Deathclaw pens where you may find 2 hostile Deathclaws inside their respective pens, you cannot turn them friendly with the Deathclaw Control Scrambler, but in one of the other hangars you may find one that you can turn friendly.

Find the Access Terminal to lower the ramp on the Mobile Platform
To Find the Access Terminal is at the top of the flight control tower, at the other end of the base. When you go through a destroyed hangar and enter to a large field in front of you is a building with a radar on it, the tower control building is to the left once you exit the destroyed hangar. There are stairs on the west side of the control tower building, use these to climb to the roof and head towards the tower, there will be a door that will allow you to enter the control tower. You can alternatively enter the building from the ground floor, avoiding the turrets on the roof. Once inside use the stairs to go to the very top of the tower and use the the access terminal to lower the ramp, granting you access to the Mobile Base Crawler.

Enter the Enclave Mobile Platform
Exiting the flight control tower, head down the stairs and take a left, heading through what was previously an Enclave Repulsion Field. Then you will see a big building with a radar disk on it. That is the Mobile Base Crawler. There is a small ramp leading up to the door, so head up there.

Destroy the Enclave Mobile Platform with an Orbital Strike
The first thing you come across is another Enclave Repulsion Field. Using the terminal to the right, you can deactivate it (Science 80), set a timed charge (Explosives 50), or smash the control panel. Smashing the panel will cause an explosion, which will damage you, as will setting the charge. The difference being that you have time to escape. Either way, the field will still be partially active, and will cause damage by passing through it. Turning the fields off will be quite harmless. Turning left and heading into the repair bay yields plenty of ammunition, as well as an encounter with Stiggs, who fixes the robots. Talking with him gives some great information:
 * The floor above is the Deathclaw research facility, so there may be one or two left.
 * There are only a few Enclave aboard compared to the usual amounts.
 * The facility is patrolled by Robots, who are all controlled through a mainframe, located on the floor above, in the middle.
 * To reach the Satellite Tower, you have to reach the Central Control Area, then to the launch platform. After the platform, you'll probably have to fight a lot of Enclave to reach the tower.

Heading up the ladder at the back brings you to the Deathclaw Research facility. Heading straight through the door ahead,and looking right and then round the corner to the left a little is a Deathclaw. If you got the Deathclaw Control Scrambler then release him, and let him wander, killing for you. Upstairs you can find the Slo-Burn Flamer. From entering, going upstairs to the front-left corner you will find the medical bay, and to the right, access to the mainframe. Hacking the mainframe requires 75 Science (Hard). The terminal allows you to shut down the robots, scramble the targeting parameters, or (using the Robotics Expert perk) target the Enclave. A terminal across from the mainframe allows you to unlock interior doors, exterior doors, and the armory, where you can find an alien blaster in one crate (locked hard) with some power cells. Head towards the launch pad, using the ladder at of the mainframe room. Note that enemies on top of and around the Mobile Platform will respawn occasionally, weapons and ammo on previously killed enemies may also respawn, so if you are looking for a particular kind of loot that is common on Sentry Robots or Enclave Soldiers you may want to exit the Mobile Platform and re-enter it a few times, just to increase the already huge supply of loot available before blowing it all up.

If you were able to set the Enclave as targets at the mainframe, then be happy! There are plenty of turrets and Sentry Bots up here that pretty much take care of the Enclave for you. Head to the Satellite Tower. Once inside, head to the top, to the terminal. Make sure you've thoroughly searched the crawler, since there's tons of ammo and weapons then hit 'fire Payload', then chose your target:


 * Preset Target 01: Citadel
 * Preset Target 02: Project Purity
 * Preset Target 03: Megaton
 * Preset Target 04: Rivet City Carrier
 * Preset Target 05: Adams AFB Platform

Only two of the targets can be fired upon: Adams AFB Platform, or the Citadel. Once you make your choice, head through the door at the top back outside, where Sentinel Lyons shows up in a Brotherhood of Steel Vertibird to get you out. Hop on, and away you go!

If you chose the Citadel: You are rewarded with 1000 negative karma, and on the flight back the pilots seem to think the Vertibird is malfunctioning when the Citadel won't respond to radio. Upon landing and seeing the smouldering ruins, they quickly pick up that it was you, and attempt to kill you, deeming you a traitor. Any other Brotherhood of Steel members you meet, like in the Washington Monument, Arlington Library, and the Jefferson Memorial Purifier, will be hostile as well.

If you chose Adams AFB Platform: You are rewarded with 1000 positive karma, and the Vertibird lands a little off Adams AFB to allow you to watch the missiles strike. After hopping back on the Vertibird, you are taken to the Citadel, where Elder Lyons is waiting with a heart-warming speech of thanks.

Trivia

 * "Who Dares Wins" is the regimental motto of the British Special Air Service and the Australian Special Air Service Regiment

Bugs

 * Sometimes after clearing out the ghouls in the metro, the sentinel robot with the fuse will not fix the tram. The solution is simple. Kill the robot and take the fuse yourself. (Note: if you stopped the robots from attacking you at the computer, killing it will make them hostile)