The information from the test tape about a missile attack simultaneously appeared on screens at SAC headquarters and the NMCC, which quickly led to precautionary moves, including alert of NORAD interceptor forces and the premature launch of a dozen interceptors. Moreover, the National Emergency Airborne Command Post (NEACP), which received the missile attack on its computer displays, launched from Andrews Air Force Base.

"As he recounted it to me, Brzezinski was awakened at three in the morning by [military assistant William] Odom, who told him that some 250 Soviet missiles had been launched against the United States. Brzezinski knew that the President's decision time to order retaliation was from three to seven minutes. Thus, he told Odom he would stand by for a further call to confirm Soviet launch and the intended targets before calling the President. Brzezinski was convinced we had to hit back and told Odom to confirm that the Strategic Air Command was launching its planes. When Odom called back, he reported that 2,200 missiles had been launched. It was an all-out attack. One minute before Brzezinski intended to call the President, Odom called a third time to say that other warning systems were not reporting Soviet launches. Sitting alone in the middle of the night, Brzezinski had not awakened his wife, reckoning that everyone would be dead in half an hour. It had been a false alarm. Someone had mistakenly put military exercise tapes into the computer system."