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 is sent to assist a Brotherhood assault on an Enclave outpost at the southwest corner of the map (west of the Dunwich Building), reached via the Rockland Car Tunnel. The Satellite Relay Station is in a new area altogether and is heavily defended by Enclave Soldiers. The objective is to learn how the Enclave are still able to communicate and coordinate their scattered forces, even though their main base has been destroyed.

When the player arrives at Rockland Car Tunnel, they are briefed by Paladin Tristan. As in Take It Back!, Liberty Prime will take point, with the player and other Knights providing support. The first phase of the assault proceeds much like that mission, as the giant robot stomps implacably down a canyon, swatting Vertibirds out of the sky and crushing all "Communist" opposition in its path.

When the Brotherhood force arrives at the relay station, Liberty Prime analyzes it for weaknesses and then punches a hole in its wall, allowing entrance. Soon afterward, however, he warns that an uplink transmission has been detected and that an orbital strike is imminent. If the player does not stay back or immediately retreat to a safe distance from the robot, they will be killed.

Liberty Prime is wrecked by the missile strike, managing to drag himself only a few yards with his remaining arm before shutting down. In the process, his head comes off; like Deputy Weld's when Megaton is destroyed, it can be activated to hear some of his anti-Communist phrases, now slurred and garbled.

The surviving Brothers regroup, and Tristan orders the player to enter the base and find out what just happened. They must fight through many Enclave soldiers before finally reaching a computer room. Encrypted codes can be downloaded from the mainframe terminal. The player is directed to return to the Citadel with the codes for further investigation.

Trivia

 * Liberty Prime's death sequence is a reference to Frank Horrigan in Fallout 2.
 * The final moments of Prime also bear a striking resemblance to the finale of The Terminator, in which the Terminator has lost its legs and pursues Sarah Connor by dragging itself with its remaining hand. Liberty is similarly crippled and moves just the same way.
 * At the end of Broken Steel Liberty Prime's head can still be found at the Satellite Relay Station despite being in the Citadel at the same time.