, ▁Tang , ▁W ahoo , ▁G ud geon , ▁and ▁Hard er ▁received ▁an ▁additional ▁ 1 5 - foot ▁() ▁section ▁( five ▁additional ▁frames ▁between ▁frames ▁ 4 2 ▁and ▁ 4 3 ) ▁to ▁accommod ate ▁the ▁B Q G - 4 ▁Pass ive ▁Under water ▁Fire ▁Control ▁Fe as ibility ▁System ▁( PU FF S ) ▁pass ive ▁r anging ▁son ar ▁installation , ▁with ▁three ▁tall ▁dom es ▁added ▁to ps ide , ▁and ▁additional ▁fire ▁control ▁equipment ▁that ▁enabled ▁the ▁use ▁of ▁the ▁Mark ▁ 4 5 ▁nuclear ▁tor ped o . ▁This ▁left ▁the ▁boats ▁similar ▁in ▁size ▁and ▁cap ability ▁to ▁the ▁G UP PY ▁III ▁convers ions . ▁ ▁Museum ▁ships ▁Two ▁boats ▁of ▁this ▁class , ▁T CG ▁Pi ri re is ▁( ex - T ang ) ▁and ▁T CG ▁H iz ir re is ▁( ex - G ud geon ), ▁are ▁preserved ▁as ▁museum ▁ships ▁in ▁Turkey . ▁ ▁Ex - T ang ▁is ▁at ▁the ▁ İ nc ir alt ı ▁Sea ▁Museum , ▁in ▁ İ z mir , ▁and ▁ex - G ud geon ▁is ▁at ▁the ▁K oc ael i ▁Museum ▁Sh ips ▁Command ▁in ▁Iz mit . ▁ ▁References ▁ ▁Cit ations ▁ ▁S ources ▁ ▁Black man , ▁Raymond ▁V . B . ▁Jane ' s ▁Fight ing ▁Sh ips ▁ 1 9 7 1 – 7 2 . ▁London : ▁Sam pson ▁Low , ▁Mar ston ▁& ▁Co ., ▁ 1 9