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.
I'm not sure if this is better or worse than the combination to the shield in Spaceballs -- it does have more digits, but it is the first number a brute force attack would hit.
