Death From Above

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

Theories
This implies that the player will be inserting by air into Washington DC, as per the motto of the 101th airborne during WWII. However, how exactly this will work is not currently known as there are no vehicles ( or airplanes) to use for such an assault. However, one can hope that there will be vehicles ( maybe you can drive one! that would make exploration of the wastes a lot easier wouldn't it?) as that seems to be the only option, unless Bethesda just ran out of time and decided to just throw it in there. Hopefully, they know that we here at wikia would start a riot if they were low enough to do that. But they wouldn't do that. Right?