Who Dares Wins

 is a Fallout 3 quest and achievement that is added to the game in the Broken Steel add-on.

Walkthrough
Well, this is it. The last of the main quests, so far. Tristan has tasked you with infiltrating the Enclave's final, massive base at Adams Air Force Base, and destroying it with an orbital strike. The quest begins at White House Plaza. The Utility tunnel that leads to the White House crater now also has a connection to the Presidential Metro, which should lead directly to Adams. Reach White House Plaza through any means you have, and enter the tunnels. The Metro is crawling with Mister Gutsys and Sentry Bots. You'll proceed down several different tunnels before meeting with M.A.R.Go.T., the protector and dispatcher of the Metro. The robots (and M.A.R.Go.T, to some extent) are initially hostile, but if you pass a difficult Speech or Science check, or present a valid Senate Employee ID, M.A.R.Go.T will mark you as a friendly, and you'll have a chance to pump her for information.

Contain the Security Breach
Among other things, you can learn that the train to Adams is offline, due to a "security breach" which has resulted in "the forced removal of a main fuse." M.A.R.Go.T can repair the fuse and train, but only if the breach is contained. According to her, the intruders have depleted 22% of the Metro security units, have no internal body heat, and are emitting lethal levels of radiation - obviously a sensor malfunction. The Metro units should be able to handle the breach on lower levels, but higher levels can result in facing several more deadly foes, which will make short work of the Sentry Bots and you too if you aren't careful. If you aid in containing the breach, the Presidential Sentinel Unit will repair the Adams tram for you; if not, you can find the Main Fuse on its body, and can use it and a Repair check to fix the train yourself.

Enter Adams Air Force Base
After a quick ride on the train, you'll wind up in the Adams Metro station. Continue through the tunnels, and you'll encounter the first of many Enclave Soldiers here at Adams. Reach the surface, climb the stairs, and take a left to find the "Resupply Crate" Tristan mentioned. Inside is a fully repaired Tesla Cannon, 50 Electron Charge Packs, 50 Microfusion Cells, and your Orders, contained within a voice recording, courtesy of Tristan. Proceed to the right, and begin the long trek to the Mobile Base Crawler. The path is full of Enclave troops, regular and Hellfire, banks of Mark VII turrets, Deathclaws and several combat ready Vertibirds. Make use of the Tesla Cannon to destroy the Vertibirds in one shot, and anything else, guns, grenades, followers, to stave off the Enclave hordes. As you approach your next objective, you'll begin to see Vertibirds gunning down the runway, lasers firing in all directions. This is the "distraction" Tristan promised, but it doesn't seem to work very well.

Find the Access Terminal to lower the ramp on the Mobile Platform
The Mobile Base Crawler can only be entered via a ramp. To lower the ramp, you'll need to enter the Air Traffic Control Tower, and find the Main Access Terminal. When you reach the main battlefield on the runway, take a right and enter the small building through a set of stairs on the west side. Inside are a few Enclave robots, which can range from Robobrains to Sentry Bots, depending on your level. When you reach the top, activate the unlocked terminal and hit the "Lower Access Ramp" entry. Beware, though, that as you enter the control tower, three Vertibirds will appear overhead, the last of which fires three missiles straight at the tower. The resulting explosions could easily cripple or kill you, so it is best to take cover on the stairs.

Enter the Enclave Mobile Platform
Make your way back down to the runway, and head on over to the ramp. There are several more Enclave troops, but a Brotherhood of Steel task force will arrive and cover you. Run up the ramp, and enter the final Enclave stronghold.

Destroy the Enclave Mobile Platform with an Orbital Strike
The first thing you come across is an Enclave Repulsion Field. Using the blue panel to the left, 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 passing through it will cause damage. If deactivated with Science, the field will be harmless.

Turning left will introduce you to Enclave Squad Sigma after an alarm goes off. Turning right 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 a Deathclaw research facility, but the majority are out fighting in checkpoints across the Wastes.
 * The Enclave only has so many bodies to throw around, and you've already killed off a lot of them. There aren't as many left inside.
 * 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 have to fight through the last Enclave flunkies left to reach the tower.

Heading up the ladder in the repair bay or the stairs where Sigma Squad attacked will lead to the second level. Your target is the mainframe in the center of the floor. The Deathclaw research facility should contain one or two Enclave-controlled Deathclaws, which will be a great asset if you still have the Deathclaw Control Scrambler. The mainframe is locked behind several "High Clearance" doors, which can only be opened with a High Clearance Keycard. The various Enclave Officers each carry one, which will open all the doors. The mainframe itself is divided into two sections: Door control and Robot control. The Door control terminal is unlocked, and can be used to unlock any doors on the floor, the Armory, and the doors leading to the Platform. The Robot terminal is locked Hard, but if hacked, you can deactive all the robots, or scramble their targeting parameters. If you have the Robotics Expert perk, you can even reverse the friend-or-foe settings, marking the Enclave as hostile, and yourself as friendly.

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, then hit "Fire Payload" and choose 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. Be warned, anything in the Crawler will be lost forever, no matter which choice you make, so clear it out before you make the decision. Once you make your choice, unlock the door from the active terminal to your right, and head through the door at the top back outside, where a Brotherhood of Steel Vertibird lands to get you out. If Sentinel Lyons survived the activation of Project Purity, she will personally escort you to the Vertibird. 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
 * If you look closely at the defunt security cameras in the Presidential Metro, you can see that the "eye" of the camera is identical to the Eye of HAL 9000, from 2001: A Space Odyssey. You can also see cameras in Vault 101, the demo Vault in the Museum of Technology, and the entrance of the Reilly's Rangers Compound.

Videos
thumb|300px|left|Ending 1, Blow Up The Enclave Satellite Control thumb|300px|right|Citadel destruction and reward

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)
 * During the assault on the Mobile Base Crawler the Brotherhood of Steel participating in the battle can appear without their armor. Clad in only underwear they are quickly dispatched by the Enclave.
 * (Xbox360) If you have Dogmeat and don't take him along (e.g. tell him to wait somewhere for you) then at the end for some reason he dies.
 * During the assault on the Adams Air Force Base, on the section where vertibirds are parked and others drop more troops, while there are many Enclave soldiers. After killing all the Enclave in this area and looting their corpses for armor(I never took their weapons), I saved the game while entering the hangar and everytime I load the game in that save all the Enclave soldiers revive and attack me (Most of them were decapitated when i first killed them and when they revived there bodies were complete and there were no traces around of them ever dying before), but because I looted their armor they were all naked and I killed them quickly.(Xbox 360)