 This was the most numerous US submarine class.Nine of the 52 US submarines lost in World War II were of this class, along with five lost postwar, including one in Turkish service in 1953, one in Argentine service in the Falklands War of 1982, and one in Peruvian service in 1988.Also, flooded and sank while fitting out at the Boston Naval Shipyard on 15 March 1945.