USS Salmon (SS-573) alongside the guided missile cruiser USS Galveston (CLG-3) during a mail call in the Pacific Ocean, in November 1965. The US Navy built three radar picket submarines in the 1950s, sizable boats they all were. Two were sisters USS Sailfish (SSR-572) & USS Salmon (SSR-573), the third USS Triton (SSRN 586), which were some of the largest conventional powered boats constructed.