Elder's keycard

The Elder's keycard is a Quest item in Fallout: New Vegas.

Location
The player can obtain the Elder's keycard by pickpocketing it from either Elder McNamara or Hardin (depending on how you completed Still in the Dark), in the Brotherhood of Steel Bunker located in the Hidden Valley. It can also be obtained by killing them.

Quests
This is one of the 3 keycards required to start the self-destruct sequence during For the Republic, Part 2, Render Unto Caesar or The House Always Wins, V and Wild Card: Side Bets.