Fallout Wiki
Fallout Wiki

All right, you. Keep your weapons holstered, your hands to yourself, and your mouth shut.

Defender Sibley is a member of the Brotherhood of Steel Outcasts located at the Outcast outpost in Bailey's Crossroads, in the year 2277.


Once the player completes the Anchorage Reclamation simulation and opens the locked door to the armory, Sibley will attempt a mutiny with his forces against Protector McGraw, feeling that the player character doesn't deserve any of the technology within the armory.

Interactions with the player character

Interactions overview

FO76 ui icon quest.png
This character is involved in quests.


Other interactions

  • Sibley will mistake a player character entering the Outcast outpost wearing Outcast power armor for one of them, and will take them to McGraw thinking this.
  • If the player character is a female and has the Black Widow perk, a unique dialogue option will appear when the player character enters the base and speak to Sibley. He will lead to Protecter McGraw without the aggression.


Apparel Weapon Other items
Outcast power armor Minigun


  • Defender Sibley is the weakest human antagonist in Fallout 3, as even at his highest possible level, his stats are even lower than the members of Enclave Squad Sigma from Broken Steel. His S.P.E.C.I.A.L. stats are set like those of a Scribe.
  • Killing Defender Sibley before entering the simulation will cause the mutiny not to trigger, and the player character is free to enter the armory without any of the Outcasts turning hostile.

Notable quotes

  • "All right, you. Keep your weapons holstered, your hands to yourself, and your mouth shut."
  • "I got loads of problems, chump. You don't want to become one, so shut up and get in the... the simulator thing there. Move it!"
  • "What's going on is this whole mission is one big rat-fuck. We've been stuck here for way too long with no results. McGraw won't give up, so we've stooped to using chumps like you to try and get something out of this place."


Defender Sibley appears only in the Fallout 3 add-on Operation: Anchorage.

Behind the scenes

Outcast members Sibley, Olin, McGraw and Morrill, all of whom appear in the Fallout 3 add-on Operation: Anchorage, appear to be named after buildings on the campus of Cornell University, including Sibley Hall, Olin Hall, Olin Library, McGraw Hall, McGraw Tower and Morrill Hall.