Name/Hull Nbr                                                Class                    Conversion Yard/Year                Country

USS Barb (SS220)                                           Gato                     Portsmouth/1954                        Italy

USS Dace (SS247)                                           Gato                     Portsmouth/1955                       Italy

USS Hawkbill (SS366)                                     Balao                   Electric Boat/1953                     Netherlands

USS Icefish (SS367)                                        Balao                    Electric Boat/1953                     Netherlands

USS Jallao  (SS368)                                        Balao                                       

    The Guppy IB program  was another interim conversion which converted four boats for transfer to foreign navies.  These boats had snorkels and were somewhat like the Guppy IA except that they were not equipped with the latest sonar, fire control systems and ESM.