In this Thursday, Aug. 27, 2015 photo former Soviet missile defense forces officer Stanislav Petrov poses for a photo at his home in Fryazino, Moscow region, Russia, Thursday, Aug. 27, 2015. On Sept. 26, 1983, despite the data coming in from the Soviet Union's early-warning satellites over the United States, Petrov, a Soviet military officer, decided to consider it a false alarm. If he had decided otherwise, the Soviet leadership could have responded by ordering a retaliatory nuclear strike on the United States. (AP Photo/Pavel Golovkin)