▁pat rol ▁on ▁ 2 6 ▁April ▁ 1 9 4 5 , ▁Gr ou per ▁sa iled ▁the ▁following ▁day ▁for ▁San ▁Francisco ▁and ▁over ha ul . ▁She ▁returned ▁to ▁Pear l ▁Har bor ▁on ▁ 6 ▁August , ▁but ▁V - J ▁Day ▁cancel led ▁plans ▁for ▁another ▁pat rol , ▁and ▁on ▁ 9 ▁September , ▁Gr ou per , ▁in ▁company ▁with ▁ ▁and ▁, ▁sa iled ▁for ▁New ▁London . ▁Four ▁years ▁of ▁local ▁operations ▁and ▁training ▁exer cis es ▁along ▁the ▁coast ▁to ▁Florida ▁and ▁in ▁the ▁Car ib bean ▁followed ▁for ▁Gr ou per . ▁During ▁this ▁period , ▁she ▁ch alk ed ▁up ▁two ▁" first s ": ▁in ▁ 1 9 4 6 ▁she ▁became ▁the ▁first ▁sub marine ▁to ▁have ▁a ▁Com bat ▁Information ▁Center ▁installed , ▁and ▁the ▁following ▁year ▁she ▁effect ed ▁the ▁first ▁dis charge ▁and ▁recovery ▁of ▁men ▁from ▁a ▁sub mer ged ▁and ▁under way ▁sub marine . ▁▁▁ 1 9 5 0 ▁– ▁ 1 9 5 7 ▁ ▁These ▁operations ▁ended ▁ 5 ▁March ▁ 1 9 5 0 ▁as ▁Gr ou per ▁entered ▁the ▁Mare ▁Island ▁Naval ▁Sh ip yard ▁for ▁conversion ▁to ▁the ▁Navy ' s ▁first ▁" h unter - k iller ▁sub marine ". ▁Her ▁classification ▁was ▁changed ▁to ▁SS K - 2 1 4 ▁on ▁ 2 ▁January ▁ 1 9 5 1 . ▁With ▁the ▁addition ▁of ▁a ▁sn ork el ▁and ▁extensive ▁son ar ▁and ▁rad ar ▁facilities