Stanislav Petrov, Lt. Colonel in Soviet Air Defence Forces (born 1939)

Stanislav Yevgrafovich Petrov was a lieutenant colonel of the Soviet Air Defence Forces who played a key role in the 1983 Soviet nuclear false alarm incident. On 26 September 1983, three weeks after the Soviet military had shot down Korean Air Lines Flight 007, 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 four more. Petrov judged the reports to be a false alarm.

The Soviet Air Defence Forces was the air defence branch of the Soviet Armed Forces.

May 19 is the 139th day of the year in the Gregorian calendar; 226 days remain until the end of the year.