Mark 15 (nuclear weapon)/Definition

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Mark 15 (nuclear weapon) [r]: First "lightweight" U.S. thermonuclear bomb with 1.68-3.8 Mt yield; 1200 produced 1955-1957; retired 1961-1965; minimal thermonuclear fuel in Secondary with most yield coming from uranium tamper; one remains lost in water off Savannah, Georgia near Tybee Island