USS Grayback (SSG-574)

USS Grayback (SSG-574) was a Grayback-class submarine commissioned by the United States Navy in 1958. Originally designed as a guided missile submarine, she was equipped to launch Regulus I and II nuclear cruise missiles, serving as a critical component of the Navy's early sea-based strategic deterrent during the Cold War. In the mid-1960s, Grayback was converted to serve as an amphibious transport submarine, supporting special operations and covert missions, including carrying SEAL teams and UDT personnel. She remained active until her decommissioning in 1984, after which she was eventually sunk as a target in 1986.