At 2:26 AM on 3 June 1980, Colonel William Odom of the Strategic Air Command alerted National Security Advisor Zbigniew Brzezinski that the US nuclear warning system had detected an imminent 220-missile nuclear attack on the US. Shortly thereafter, the automated system revised its projection from 220 missiles to an all-out attack of 2200 missiles. Just before Brzezinski was about to wake up President Carter to authorize a counterattack, he was told that the 'attack' was an illusion caused by 'a computer error in the system'.