On September 26, 1983, Stanislav Petrov made the correct decision to not trust a computer. The early warning system at command center Serpukhov-15, loudly alerting of a nuclear attack from the United States, was of course modern and up-to-date. Stanislav Petrov was in charge, working his second shift in place of a colleague who was ill. Many officers facing the same situation would have called their superiors to alert them of the need for a counter-attack. Especially as fellow officers were shouting at him to retaliate quickly before it was too late. Petrov did not succumb.