With nuclear apocalypse looming over the world, several vaults were constructed to contain the best and brightest of humanity. By being shielded from the imminent death, the offspring of these people could reclaim and repopulate the Earth. However, before the entire network could be completed, nuclear war broke out. One of the vaults became militaristic and technology-driven. Using their superior weapons, they were able to claim the surrounding wasteland. The members of this vault formed the Brotherhood of Steel, an organization dedicated to unlocking new and better technologies.
Fallout Tactics Manual. Information on storyline, interface, characters, and gameplay.