The Brotherhood of Steel (commonly abbreviated to BoS) is a post-War techno-religious paramilitary organization with chapters operating across the ruins of America. The group has its roots in the United States Armed Forces, founded by a United States Army security team stationed at Mariposa Military Base before the Great War. While the goals of the Brotherhood vary from chapter to chapter, they share a core mission centered on seizing and regulating pre-War technology throughout the wasteland. Though small, the Brotherhood has been an influential group in the history of the wasteland, first as a survivalist group, then a major research and development house, then finally as an enemy of the New California Republic, fighting a bitter war for control of technology in New California. Having suffered defeats in the West, the Brotherhood would be strengthened on the Eastern reaches of the continent, under Elder Arthur Maxson. Their motto is "Ad Victoriam".