Auxiliary Research Submarine | EXCLUSIVE ✦ |

: Served for 38 years (1968–2007), the longest career of any Navy submarine at the time of its retirement.

: Proved that a single-screw design was superior for submerged control, a standard still used in modern nuclear submarines. USS Dolphin (AGSS-555) auxiliary research submarine

Testing of "silent" propulsion systems to reduce acoustic signatures : Served for 38 years (1968–2007), the longest

The USS Albacore was perhaps the most influential research submarine ever built. : Served for 38 years (1968–2007)

Details on the used for deep-sea acoustic testing. Tigrone (SS-419) (SSR-419) (AGSS-419) - NavSource