During the height of the Cold War, the US Strategic Air Command installed special locks, called "Permissive Action Links" on the Minuteman missle force.
Because the SAC were less concerned about unauthorised launches than they were about the poential for these locks to interfere with the implementation of wartime launch ordres, they changed the combinations for all these locks to be "00000000" which remained unchanged through the Cold War.
See http://www.cdi.org/blair/permissive-action-links.cfm.
Wednesday, June 02, 2004
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