Death From Above

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

Walkthrough
The player joins the Brotherhood as well as Liberty Prime to an Enclave controlled area found west of the Dunwich Building. This area is in a new area altogether and is heavily defended by Enclave Soldiers. The player must try to find information about the Enclave who seem to still be able to communicate with each other, even though they are spread thin throughout the wasteland.

As they continue to the fortified base, Liberty Prime breaks the wall to the base, allowing entrance. Shortly after he states of an incoming nuclear strike and warns the Brotherhood to retreat to a safe distance. It is advised to keep a safe distance or save when Prime destroys the building as the nuke bombardment will easily kill the player character.

When the bombs fall, Liberty Prime is destroyed (although similar to Deputy Weld, Liberty Prime's head can be activated and he will say some of his anti-communist phrases.) The Brotherhood then regroups and enters the base. Several Enclave soldiers are found within and eventually the player will encounter a computer terminal with encrypted codes which he/she must return to the Citadel for further investigation.