Operation Anchorage, part of the second round of Fallout 3 downloadable content to be released. It starts out by giving your character a radio signal once you start up the game after enabling the content, then follow the quest trial to some Brotherhood Outcasts fighting off a group of supermutants. Once all the blood and dust is settled, they notice the Pipboy on your wrist and ask you to help them out in unlocking an armoury which can only be done by going through a simulation of the war in Alaska against the Chinese communists. Oh, and the catch being if you die in the simulation, YOU DIE FOR REAL! So long as you make it out alive, the Outcasts promise you can take whatever you want in the armoury, so it's not like you're doing it for nothing.