Soviet Strategic Forces Went on Alert Three Times during September-October 1962 Because of Apprehension over Cuban Situation, Top Secret Codeword History of National Security Agency Shows
From The National Security Archive, 14 November 2008 post by Mathew Aid:
Forty-six years ago, a month before the Cuban Missile crisis, Soviet leaders put their strategic forces on their “highest readiness stage since the beginning of the Cold War,” according to a newly declassified internal history of the National Security Agency published today for the first time by the National Security Archive…
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