The USS Mariano G. Vallejo (SSBN-658) was a Benjamin Franklin-class fleet ballistic missile submarine built by Mare Island Naval Shipyard in Vallejo, California. Her keel was laid on July 7, 1964, following the award of the construction contract on August 8, 1963. Launched on October 23, 1965, and sponsored by Miss Patricia Oliver Vallejo McGettigan, she was officially commissioned on December 16, 1966. The submarine was named after Mariano Guadalupe Vallejo, a notable advocate of California statehood. Designed as a strategic nuclear deterrent vessel, Mariano G. Vallejo initially carried POLARIS A-3 missiles. After her commissioning, she conducted shakedown and training exercises along the U.S. West Coast, the Caribbean Sea, and off Florida. She transited the Panama Canal for her home port, Pearl Harbor, Hawaii, arriving in April 1967. As part of Submarine Squadron 15, she became fully operational by August 1967, participating in deterrent patrols involving extended submerged missions averaging around 70 days, with alternating blue and gold crews. Early patrols are believed to have been supported from Guam. In the early 1970s, the submarine was selected for upgrade to carry the newer POSEIDON C-3 missiles. Her overhaul began on August 21, 1972, at Newport News Shipbuilding, including weapons system conversion, navigation, and sonar system updates. She returned to active service as a POSEIDON-capable SSBN on December 19, 1973. Mariano G. Vallejo was the last of the "Forty-one for Freedom" to patrol, off-load missiles, and arrive in Washington, symbolizing the end of an era. Decommissioned and stricken from the Naval Vessel Register on March 9, 1995, her scrapping was completed by December 1995 through the Navy's recycling program. Her sail was preserved and later moved to the Mare Island Museum as a memorial, with her control room reconstructed and a fully operational periscope on display. Mariano G. Vallejo's service marked a significant chapter in U.S. strategic nuclear deterrence during the Cold War era.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.