USS Dolphin (AGSS-555) was a United States Navy diesel-electric deep-diving research and development submarine. She was commissioned in 1968 and decommissioned in 2007. Her 38-year career was the longest in history for a US Navy submarine to that point. She was the Navy's last operational conventionally powered submarine.
USS Dolphin
Image: USS Dolphin AGSS 555 Badge
Dolphin berthed next to Berkeley at the San Diego Maritime Museum
Ship Characteristics Board
The Ship Characteristics Board was a unit of the United States Navy.
Project SCB 1 result: the USS Norfolk (CLK-1/DL-1)
Thresher, the first result of project SCB 188, at sea on 24 July 1961