page_title: Regulus missile submarines
section_title: USS Grayback
hierarchical_section_title: Regulus missile submarines / List of boats / USS Grayback
context_page_description: The Regulus missile submarines were a group of submarines operated by the United States Navy capable of carrying the Regulus cruise missile. Between 1959 and 1964, a total of five boats were used to undertake the first submarine-based nuclear deterrent patrols by the United States. Regulus submarines were used for this task until 1964, when sufficient ballistic missile submarines carrying the Polaris ballistic missile became available.
context_section_description: Grayback was originally commissioned in March 1958, the first submarine built to accommodate Regulus. She was used for testing of Regulus II in September 1958 before the project was cancelled. In February 1959 she was deployed to Pearl Harbor to form part of Squadron 1 and undertake strategic deterrent patrols, which continued until 1964, following which Grayback was decommissioned. In November 1967, a new conversion was undertaken to transform the boat into an amphibious transport submarine. She was used as a transport for SEALs and divers on special operations during and after the Vietnam War, before finally being decommissioned in January 1984. Grayback was expended as a target in the South China Sea in April 1986.
caption: Grayback at sea in 1982
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