orion served subron 4 out of charleston naval base, pier november during the 1970s. on 15 october 1970, orion's homeport changed to charleston, south carolina under the command of submarine squadron four. from july 1979 through march 1980, orion underwent overhaul in charleston naval shipyard in preparation for an overseas change of homeport. on 1 june 1980, orion's homeport was changed to la maddalena, sardinia, italy.