| ||For other characters named Roger, see Roger.|
The team and research personnel were later relocated to the Mariposa Military Base on January 7, 2077, where further FEV research was conducted. On October 10 Maxson and his men learned about the human experiments going on in the base, morale suffered a hefty blow. The original leader of the security team, Colonel Robert Spindel, suffered a nervous breakdown and locked himself in his office and Maxson assumed his command.
Captain Maxson then took control of the entire base and began interrogating the scientists. After interrogating chief scientist Robert Anderson and learning what was really happening on the base, Maxson executed him. Two days later, Spindel committed suicide and Maxson ordered all the scientists to be interrogated and finally executed. Confused and detached, Maxson declared himself and his men in full desertion from the army via radio. No answer came as the political situation was at its climax and the Great War was at hand.
The personnel families stationed outside the base were ordered to move inside the base on October 20 and two days later the bombs fell. Maxson and his men survived the war unharmed, safely sealed inside the Military base unaware that the world had ended around them. After making sure the radiation levels outside were safe, Maxson ordered everyone to leave the accursed military base and travel to the Lost Hills government bunker. After burying the scientists, Maxson's soldiers and their families began the Exodus to Lost Hills. Raider attacks inflicted a heavy toll of casualties, including Maxson's wife, but his teenage son survived. Maxson and his men later formed the Brotherhood of Steel and the Lost Hills facility served as their main base.
Maxson became the first high elder of the Brotherhood of Steel, forming the orders of knights, scribes, and paladins. In 2097 his grandson, John Maxson was born. Roger Maxson eventually died of cancer in 2135 and his son, already an accomplished soldier took up the role of the high elder, which stayed with the Maxson family until John's death.
After his death, the Brotherhood regarded Roger Maxson as an almost holy figure. Two places are known to be named after either him or his descendants - Maxson, one of the states of the New California Republic, and Maxson bunker, a Brotherhood of Steel outpost somewhere to the east of California.
The only known current living descendant of Roger Maxson is the young Arthur Maxson, who spent his childhood inside the Citadel in the Capital Wasteland, under the care of Owyn Lyons and the East Coast detachment of the Brotherhood of Steel. In the year 2287, he is the elder in charge of the East Coast detachment aboard the Prydwen in the Commonwealth.
Roger Maxson does not appear personally in any of the Fallout games but is mentioned in holodisks and in Brotherhood of Steel dialogues.