True Camelot

In the aftermath of the third Great War, and the decimation of the world, those who could not afford Vaults were either killed by the bombs or survived in inferior bomb shelters or on the surface, becoming horrifically mutated and irradiated. Those who were lucky enough to be in Vault 209 would find they had access to a long term VR entertainment simulation, to wait out until the all clear signal was given to Vault Dwellers. This interlinked multiplayer system featured an MMO, in particular, a stylized version of the the Legends of King Mordred. The group was entranced by the immersion, after many years of gameplay truly believed themselves to be the brave, heroic knights saving their kingdom from the ever encroaching evils of the world, and of Mordred, their kind and just King. The game featured some new interpretations, such as Knights being able to recognize the change in warfare. Not with swords and horses, but with guns and motorcycles did they ride in bullet proof armors.
Their time spent in such long sessions on the simulation has addled their senses of reality somewhat. When they left the simulation pods, they did not take of the HUD goggles that almost every individual man or child wear, which they use for everything from counting the "points" they've earned after killing monsters and evil, bartering goods and services for digital coin, about the "enemies' stats" and how many points in "karma" a good or evil action would bring.
Having had to leave their vault, they took the lessons they learned to heart, and created an overworld society based on the Camelot of the video game. Preparing and fortifying, the Knights of True Camelot stand ready to bring justice to the world world, and bravely lend a aid to all who need it!