National Archives security password is a paper note in Fallout 3.
Location[]
It is given to the player after accepting Sydney's help in recovering the Declaration of Independence during the quest Stealing Independence.
Transcript[]
I've learned from Sydney that password to unlock the Rotunda cargo lift to the lower level is "We the People."
Related quest[]
Behind the scenes[]
The password is equivalent to the real life US Constitution, where the first three words are "We the people".