Brotherhood of Steel

The Brotherhood of Steel (BoS) is a techno-religious organization, with roots in the American military and government-sponsored scientific community from before the Great War. The Brotherhood is mostly composed of the descendants of those military officers, soldiers, and scientists, but aside from some outsiders among their ranks, the Brotherhood is as close to pure-strain humanity (prime normals) that may be found outside of a Vault or the Enclave.

Appearances
The Brotherhood of Steel appears in all Fallout games.

Holodisks about the Brotherhood of Steel
Fallout Fallout Tactics
 * Captain Maxson's Diary
 * Maxson Log
 * Ancient Brotherhood Disk
 * Sophia Tape
 * Brotherhood Code (non-canon)
 * Journal of Sir Latham
 * General's holodisk to wife Maria

Inconsistencies
The Brotherhood of Steel as portrayed in the Fallout spin-offs is radically different from the one in the role-playing games. While in Tactics it is because the BoS portrayed there is a splinter faction, there is no explanation for the differences in Fallout: Brotherhood of Steel. Tactics also contains numerous other inconsistencies with the established persona of the Brotherhood.