Adams Air Force Base

 is a heavily fortified Enclave settlement outside the Capital Wasteland, available in the Broken Steel add-on for Fallout 3. The base can only be accessed through the Presidential Metro and not before you have reached the appropriate point in the quest line. The base is a separate, new area outside of the Capital Wasteland. It appears to be as big as the locations from the previous add-ons The Pitt and Operation: Anchorage.

Related quest: Who Dares Wins
During the Who Dares Wins quest the player is sent to wipe out the remaining Enclave soldiers in the Capitol Wasteland at Adams Air Force Base. The base contains a mass of Enclave soldiers, as well as standard defenses such as Sentry Bots and Automated Turrets.

Notable loot
After the end of "Who Dares, Wins"
 * 400 X Flamethrower Fuel - There is a holo-tape regarding flamer fuel that can be found in a hanger with research areas and walkways. The message says that the fuel is located due West of the Air Control Tower beneath a pile of tires and barrels (West-NorthWest Corner). The fuel is in a (Very Hard) locked crate.  The Enclave scientist with the holotape also carries the key to the stash.
 * 2x Mini-Nuke in a corridor of the aircraft hanger with three derelict jet planes inside. One is hidden under a desk, the other is hidden behind a filing cabinet.
 * Lots of Scrap Metal (30+ pieces).
 * Lots of medical supplies including Stimpaks and Blood Packs.
 * Enclave Soldier Log - located on a small platform behind a large machine, in the alley directly west of the rooftop where the Sector 2 Artillery Note is located. When in the alley and looking northward, turn left (west) and enter the opening between the walls. Following the alley, then climbing the stairs, there is a large machine. A dead Enclave Soldier, a Ripper, 2 Psychos, a couple first aid boxes are all behind the machine, with the Holotape on the Enclave Soldier's body.
 * There is a Mini-Nuke, First aid box and some Microfusion cells located on an awning that is reachable from the roof with a walkway covered in steel colored pipes. During the quest, Who dares wins, this roof will overlook a large number of Vertibirds, in the first hanger area you encounter.
 * 2x Tesla Cannon and 73x Electron Charge Pack in a resupply crate on the back of a truck in front of the gates to the inaccessible area.
 * 2x Tesla Cannon and 74x Electron Charge Pack in a resupply crate in front of the fortification by hangar 4A.
 * 2x Tesla Cannon and 74x Electron Charge Pack in a resupply crate by the bottom of the ramp at the south end of hangar 2B.
 * 2x Tesla Cannon and 74x Electron Charge Pack in a resupply crate south east of the Air Control Tower, surround by a semi-circle of sand bags.

Appearances
appears in the Fallout 3 add-on Broken Steel.

Trivia
This location is based on the real-life Andrews Air Force Base and indeed, originally was to be named as such. Evidence of this can be seen in the game files, the architecture meshes are in a folder named andrewsbase.

Bugs/Exploits

 * An exploit for unlimited BoS armor, holotags, Enclave armor, ammo, and weapons (including the occasional BoS Paladin equipped with a Tesla Cannon) during the initial assault on Adams AFB. Just before you cross onto the runway after the deathclaw cages, BoS and Enclave troops are seen battling behind the blue pulse repulsion field. You can then cross onto the runway and either kill (bad karma) or wait for the Enclave to kill the BoS troops to collect their items. However, the fallen bodies disappear after about 10 seconds. The troops will respawn when you cross through the wrecked hangar back towards the deathclaw cages. This can be repeated to your heart's desire (or your carrying capacity). (Xbox 360)
 * Sometimes wrecked vertibird pieces hang in midair then drop out of the sky when approached (Xbox 360)
 * When using the artillery strike multiple times on the parked vertibirds several vertibirds may swoop down and gun your position with gattling lasers, missiles, and mini nuke carpet bombings.
 * Three sentry bots spawn between the Enclave mobile command crawler and Adams Storage Facility.