This being the first dlc, i would say it lived up to the fallout 3 level. You received a unknown transmission which you have to investigate, upon reaching your destination you are asked to enter a simulation. The reason for this is to help the researchers at this secret base open an armory which has unique weapons. The simulation itself is basically the Americans fighting Chinese army. You go through the sim completing objectives which are set by the commanders who are in charge. As this is a simulation you cant die or even run out of ammo. There are health and ammo dispensers scattered around. The whole simulation should take you about 3 hours, you get to unlock a few new weapons. This dlc pack can be accessed any time of the game, you don't need to finish the game to play this.