▁previous ▁designs . ▁Because ▁this ▁design ▁is ▁somewhat ▁qui eter ▁and ▁does ▁not ▁release ▁an ▁air ▁b ubble ▁every ▁time ▁a ▁tor ped o ▁is ▁fired , ▁it ▁has ▁been ▁used ▁in ▁all ▁subsequent ▁sub marine ▁designs ▁throughout ▁the ▁world . ▁The ▁four ▁stern ▁tub es ▁of ▁previous ▁classes ▁were ▁reduced ▁to ▁two ▁shorter , ▁simpler ▁tub es ▁that ▁could ▁not ▁accommod ate ▁the ▁longer ▁anti - ship ▁tor ped o es ▁and ▁had ▁no ▁cap ability ▁to ▁act ively ▁e ject ▁tor ped o es . ▁R ather , ▁they ▁were ▁designed ▁for ▁the ▁Mark ▁ 2 7 ▁and ▁planned ▁Mark ▁ 3 7 ▁sw im - out ▁tor ped o es . ▁ ▁Sh ips ▁in ▁class ▁In ▁October ▁ 1 9 4 6 , ▁the ▁first ▁two ▁boats ▁were ▁ordered . ▁ ▁was ▁built ▁at ▁Port sm outh ▁Naval ▁Sh ip yard ; ▁ ▁at ▁the ▁Electric ▁Bo at ▁yard ▁in ▁Gro ton , ▁Connecticut . ▁In ▁ 1 9 4 7 , ▁contract s ▁were ▁awarded ▁to ▁Port sm outh ▁for ▁ ▁and ▁to ▁Electric ▁Bo at ▁for ▁. ▁Then ▁in ▁ 1 9 4 8 , ▁a ▁similar ▁pair ▁of ▁contract s ▁were ▁awarded ▁to ▁Port sm outh ▁for ▁ ▁and ▁to ▁Electric ▁Bo at ▁for ▁. ▁They ▁are ▁named ▁for ▁six ▁US ▁sub mar ines ▁lost ▁during ▁World ▁War ▁II , ▁of ▁which ▁most ▁of ▁their ▁command ing ▁officers ▁were ▁killed ▁in ▁action ▁while ▁comb ating ▁Japanese ▁surface ▁vessels . ▁ ▁In ▁ 1 9 6 7