From the PlanetXbox360.com:
"Today marks the first of a series of downloadable content for Fallout 3. Operation: Anchorage landed today and for 800 Microsoft points you can help the United States liberate Anchorage, Alaska from the Chinese communists. Instead of opening up an entire area to explore and scavenge, Operation: Anchorage is a small quest line that leads the player to the Outcast Outpost. Inside the outpost you find out that its residents need to access an armory, and to do so, they need someone that can access an old simulation. You happen to be that person. The download relies on faster paced combat/stealth, pushing Fallout's focus of exploration on the backburner. It brings fresh content to Fallout 3 with new weapons, achievements, and a new area to explore in an awkwardly different package."