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 military vaults located in California emerged from the war determined to restore civilization. Using their superior weapons, they were able to reclaim the surrounding wasteland. The members of this vault formed the Brotherhood of Steel, an organization dedicated to restoring civilization and reclaiming or developing new and better technologies.