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Size; 52.5 x 3.7 x 4.5mm
The Yankee class, Soviet designations Project 667A Navaga (navaga) and Project 667AU Nalim (burbot), was a series of nuclear-powered ballistic missile submarines built in the Soviet Union for the Soviet Navy. In total, 34 units were built: 24 in Severodvinsk for the Northern Fleet and the remaining 10 in Komsomolsk-on-Amur for the Pacific Fleet. Two Northern Fleet units were later transferred to the Pacific. The lead boat K-137 Leninets received its honorific name on 11 April 1970, two and one half years after being commissioned.
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