Aiding the Outcasts

Aiding the Outcasts is a Fallout 3 quest that was added to the game in the Operation: Anchorage downloadable content pack.

The Brotherhood of Steel Outcasts are trying to acquire advanced military tools, and the only way to enter the vault containing these relics is by completing a military simulation only the player can enter. In the simulation the player will fight in one of the greatest battles of the Fallout universe: the liberation of Anchorage, Alaska from invading Red Chinese troops.

Objectives and walkthrough
After installing the DLC you receive a message about an Outcast Distress Signal and this quest is added to your Pip-Boy.

Access to the Outcast Outpost where the simulation is located is via Bailey's Crossroads Metro just south of the Red Racer Factory. This is a fairly standard tunnel system occupied by a few feral Ghouls which links to Bailey's Crossroads.

At Bailey's Crossroads a battle is taking place between Super Mutants and Brotherhood Outcasts. The battle progresses through a building until you reach the Outcast Outpost guarded by Mark IV Turrets. Once there Defender Morrill, who led the Outcasts to the Outpost will ask you to speak with Protector McGraw at the bottom of a Freight Elevator.

McGraw will explain that there is some hi-tech equipment locked away and only you with your Pip-Boy can complete the VR program and gain access. The VR Program is Operation: Anchorage.

Note: Do not enter the simulator with Fawkes as your companion, he will die once you pass through to Anchorage. Not sure if all companions die.