Editing Gato-class submarine (section)

===Sonar test submarine===
[[File:USS Grouper (AGSS-214) underway c1961.jpg|thumb|''Grouper'' after conversion to a sonar test submarine]]
The development of advanced sonar systems took on a great deal of importance in the 1950s, and several fleet ships were outfitted with various strange-looking sonar transducer arrays and performed extensive tests. Two ''Gato''s, {{USS|Flying Fish|SS-229|2}} and {{USS|Grouper|SS-214|2}} (previously the prototype hunter-killer ship) were assigned to these duties and proved to be key players in the development of new sonar capabilities. ''Grouper'' had all her forward [[torpedo tube]]s removed and the space was used as berthing for technicians and as a sonar lab. ''Flying Fish'' was decommissioned in 1954, but ''Grouper'' continued in the test role until 1968.<ref name="Alden, Part IV"/><ref>{{harvnb|Friedman|1995|pp=69–73}}</ref>