Assigned to Submarine Development Group 2 with her home port at New London, Connecticut. Pargo was altered for acoustics at Groton then was involved in acoustic trials that resulted in alterations to all U.S. submarines. After acoustic trials the Pargo spent much of its time doing arctic research, surfacing at the north pole several times. Pargo participated in the search for the missing attack submarine USS Scorpion (SSN-589) from 27 May to 7 June 1968. She spent the rest of 1968 conducting various trials in the Caribbean Sea and off New London.
1970s
The Pargo made her 650th dive on 29 March 1978.
1980s
The "Pargo" entered dry dock at Puget Sound Naval Shipyard (Bremerton, WA) in February 1985 for an 18-month overhaul.
30 months later the boat was back in service, having upgrades to all non-nuclear systems.
1990s
The "Pargo" conducted the first civilian oceanographic submarine cruise of the Arctic Ocean in 1993.
This article includes information collected from the Naval Vessel Register, which, as a U.S. government publication, is in the public domain. The entry can be found here.