" During the late 1970s, a coded switch was finally placed in the control center of every SAC ballistic missile. It unlocked the missile, not the warhead. And as a final act of defiance, SAC demonstrated the importance of code management to the usefulness of any coded switch. The combination necessary to launch the missiles was the same at every Minuteman site: 00000000. Peurifoy "

― Eric Schlosser , Command and Control: Nuclear Weapons, the Damascus Accident, and the Illusion of Safety