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DescriptionPostcard depicting the Fleet Sonar School at Naval Station Key West. Notation on verso, 'Fleet Sonar School, U.S. Naval Station, Key West, Florida. Mission of this school is to train personnel in the tactical aspects of Anti-Submarine Warfare and in the operational and tactical use of all types of sonar and allied equipment. Each day out at sea operations are carried out with destroyers and submarines. It is one of the largest and most important in the world.'