Lost Hills

The Lost Hills old government bunker in Southern California is the headquarters of the Brotherhood of Steel, located northwest of Junktown and the Hub, southeast of the Mariposa Military Base and south of Vault 13.

History
During Great War, the Mariposa Military Base soldiers were protected from the radiation and FEV flooding the wasteland. Two days later, a scout in Power Armor (Platner) was sent out to get specific readings on the atmosphere. He reported no significant radiation in the area surrounding the facility. After burying the scientists in the wastes outside of Mariposa, the soldiers sealed the military base, then headed out into the desert, taking supplies and weapon schematics with them. Captain Roger Maxson led his men and families to the government bunker at Lost Hills, and this event was later called the Exodus. In November, Maxson and his men, and their families, arrive at the Lost Hills later, suffering many casualties along the way, including Maxson's wife (but not his teenage son). The Lost Hills bunker became the headquarters of the newly formed Brotherhood of Steel.