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The San Diego-class Heavy Frigate was a class of frigate utilized by the UNSC Navy. It was often considered a mix between a frigate and a destroyer because of its many shared characteristics. Unfortunately, production of the class ceased after just five years due to its lack of notable characteristics. Many remarked that the San Diego was just taking up space in shipyards where more efficient classes such as the Retarius-class or King-class could be built.