USS Charger (CVE-30) was an escort carrier of the United States Navy during World War II converted from a commercial C3-P&C cargo/passenger liner hull built as Rio de la Plata intended for the Moore-McCormack company's American Republics Line serving the east coast of South America.[1] Rio de la Plata was planned as the third of four ships to be built by the Sun Shipbuilding and Drydock Co., Chester, Pennsylvania for the Moore-McCormack company.[2] The modified C3 type was intended for Moore-McCormack's American Republics Line for serving the east coast of the United States to South America and the first large U.S. passenger ships to be fitted with diesel engines.Two six cylinder Sun Doxford diesels with over 9,000 shaft horsepower drove a single propeller through reduction gears for a design speed of 17.5 kn (20.1 mph; 32.4 km/h).Men trained on her decks played an important role in the successful contest for the Atlantic with hostile submarines carried out by the escort carrier groups.