Able Archer 83 = 11

https://en.wikipedia.org/wiki/Able_Archer_83

Able Archer 83 was the annual NATO Able Archer exercise conducted in November 1983.[1][2] The purpose for the command post exercise, like previous years, was to simulate a period of conflict escalation, culminating in the US military attaining a simulated DEFCON 1 coordinated nuclear attack.[3] The five-day exercise, which involved NATO commands throughout Western Europe, was coordinated from the Supreme Headquarters Allied Powers Europe (SHAPE) headquarters in Casteau, Belgium.

The 1983 exercise, which began on November 7, 1983, introduced several new elements not seen in previous years, including a new, unique format of coded communication, radio silences, and the participation of heads of government.

https://unredacted.com/2017/11/13/unearthing-soviet-secrets-in-ukraines-archives/

Documents within the KGB Archive.

The archives of Ukraine are open and they are filled with former Soviet secrets.

Anyone conducting research on the Soviet Union, nuclear history, or the Cold War should visit Ukraine as soon as possible.

After being selected as the Nuclear Proliferation International History Project’s fellow at Odessa State University’s Center for Nonproliferation, I first felt delight—the university, after all, was just a 10-minute walk down the hill to the iconic beaches of the Black Sea. But then apprehension set in: What if the archives were closed? What if they were open but bereft of key documents? What if an American foreigner was not viewed kindly by the archivists?

Fortunately, I can report that each of these fears was unfounded. The Ukrainian Archives are open (including to foreigners) and filled with historically important, previously secret documents.