Officer who trusted his instincts and prevented a nuclear war in 1983, Stanislav Yevgrafovich Petrov

In 1983, one man prevented a nuclear war between the USSR and the USA. Stanislav Yevgrafovich Petrov was the duty officer at the command center for the Oko nuclear early-warning system when the system reported that a missile had been launched from the United States, followed by up to five more. Petrov judged the reports to be a false alarm, and his decision to disobey orders, against Soviet military protocol, is credited with having prevented an erroneous retaliatory nuclear attack on the United States.