Editing Gato-class submarine (section)

===Transport submarine===
With the retirement of the Regulus missile system in 1965, {{USS|Tunny|SS-282|2}} was converted into a troop transport in 1966. She was redesignated as an APSS (transport submarine), replacing {{USS|Perch|SS-313|2}} in this role. Her Regulus hangar became a lockout chamber for [[Underwater Demolition Team|UDT]], [[SEAL]], and [[United States Marine Corps Force Reconnaissance|Marine Force Recon]] teams in the [[Vietnam War]]. On 1 January 1969, ''Tunny''{{'}}s designation was changed to LPSS (amphibious transport submarine); however, she was replaced by {{USS|Grayback|LPSS-574|2}} and decommissioned in June of that year.<ref name="Alden, Part IV"/><ref name=DANFSTunny/><ref>{{harvnb|Friedman|1995|pp=177–178}}</ref>