Adams Air Force Base

 is a location outside the Capital Wasteland which will be added to Fallout 3 in the Broken Steel DLC pack.

It's likely reached by using the Presidential Metro Line located under the ruins of the White House. an interview is here on youtube with lots of gameplay http://www.youtube.com/watch?v=E69kE96ZqsU

Appearances
appears in the Fallout 3 DLC Broken Steel.

Behind the scenes
This location is based on the real-life Andrews Air Force Base.