Power Armor (Fallout: Brotherhood of Steel)

The Power Armor in Fallout: Brotherhood of Steel is not like the Power Armors used by the Brotherhood of Steel, Enclave, or American military forces before the war. It does resemble the T-51b Power Armor a bit, however. The origin of this armor is probably an attempt by Vault-Tec to produce some valuable combat equipment to help their own Secret Vault to successfully enter the post-apocalyptic world.

Vault-Tec had access to vast knowledges of the government and other companies and probably tried to use all the technologies they could get access to. Having no option to manufacture or buy T-51 Power Armor in big amounts, they probably started they own research and produced something at least similar to the original.

Other valuable armors like Metal and Tesla, that could be found in FO:BOS, might be produced by Vault-Tec as well during the same development project.

Appearances in games
This Power Armor appears only in Fallout: Brotherhood of Steel.