In this DLC pack, the Brotherhood Outcasts are trying to acquire advanced military technology, and the only way to open the vault containing these relics is by completing a tactical 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. The simulation is set between June 2076, when the T-51b Power Armor was first introduced, and January 2077, when Chinese forces were completely driven out of Alaska.
Once the DLC is downloaded, the quest objective for Operation: Anchorage will be activated and a marker will appear on the world map, allowing the player to fast-travel to the location and begin the simulation. The DLC can be played at any time after the player exits Vault 101 at the beginning of the game. After completing the simulation, new equipment will be unlocked for the player to use in the rest of the game.
It is not confirmed, but is highly likely that you will not be able to take some or all of your inventory into the simulation, due to the fact that items such as the Plasma Rifle, Laser Rifle, Plasma Pistol, and Laser Pistol, (the versions of these weapons) are all post-war weapons, which would create a time paradox in the simulation. It is also very likey the player will have a Pip-Boy, as seen in the latest screenshots.