The Primary Alerting System (PAS), was a network of land-line connections used by the Strategic Air Command (SAC) for command and control of its nuclear forces. PAS provided immediate and simultaneous voice communications to all (SAC) unit command posts and missile launch control facilities.
The Primary Alerting System (PAS), was a network of land-line connections used by the Strategic Air Command (SAC) for command and control of its nuclear forces. PAS provided immediate and simultaneous voice communications to all (SAC) unit command posts and missile launch control facilities.
Source: Wikipedia "Primary Alert System" · CC BY-SA 4.0
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