Officer O'Brian is a member of Vault 101 security in 2277.


Lightly armored and keen to deliver a bit of punishment to the vault civilians, Officer O'Brian is a vicious, unthinking man who delights in the pain of others. The confusion of the Lone Wanderer's escape makes his violent tendencies all the more easy to hide.[1]

Officer O'Brian is guarding the locked atrium door to the Vault 101 entrance together with Officer Richards.

Interactions with the player characterEdit

Interactions overviewEdit

General Services Quests
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  • Escape!: Officer O'Brian will attempt to neutralize the player during their escape from Vault 101.

Effects of player's actionsEdit

  • O'Brian and Richards kill Tom and Mary Holden unless the player is seen by the officers before Tom reaches them. This will cause them to start shooting and scare away Tom and Mary.



Officer O'Brian appears only in Fallout 3.


  1. Fallout 3 Official Game Guide