Permit-class submarine: Difference between revisions

The '''''Permit''-class submarine''', (known as the '''''Thresher'' class''' until the lead boat {{USS|Thresher|SSN-593|6}} was lost), was a class of [[Nuclear marine propulsion|nuclear-powered]] fast attack [[submarine]]s ([[Hull classification symbol#Submarine type|hull classification symbol]] SSN) in service with the [[United States Navy]] from the early 1960s until 1996. They were a significant improvement on the {{sclass-|Skipjack|submarine|4}}, with greatly improved [[sonar]], diving depth, and silencing.<ref name="FriedmanSubs1"/> They were the forerunners of all subsequent US Navy SSN designs. They served infrom the 1960s all the way through middleto 1980sthe early 1990s, untilwhere they were retireddecommissioned due to age.<ref>Friedman, pp. 235-236</ref> They were followed by the {{sclass-|Sturgeon|submarine|5}} and {{sclass-|Los Angeles|submarine|5}} classes.