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The simulation is just like being in the matrix (movie). Sim death=massive cardiac arrest or some other scientific mumbo jumbo. In the sim you get a small amount of weapons: silenced 10mm pistol, trench knife, chinese assault rifle, gauss rifle (scoped), and a sniper rifle. After making three big explosions (YAY!) you get your weapons taken away and get to choose new ones from a few presets, and with some speech skill a new gauss rifle.
Rather then try to explain fallout to all of you who don't know: Here a walkthrough of the add-on.
Part 1

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Part 2

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Part 3

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Part 4

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Part 5, at the beginning you'll notice the three men from the anchorage war memorial statue posing for it.

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Part 6

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After beating that you get Winterized T51-b armor and helmet: the strongest armor in the game that doesn't degrade, but that not the best part: Chinese stealth armor and the gauss rifle! The armor add 15 piont to the stealth skill and creates a stealth field like a stealth boy would when you crouch. Using silenced weapons like the infiltrator (basically a silenced assault rifle) from "the pitt" add-on or melee weapons (the shishkebob being my favorite) makes it almost impossible for enemies to tell where you are! I went through the mothership zeta add-on like that!