In the 1930s, the United States Navy built two classes of flotilla leaders, the Porter class, and the Somers class. Due to the regulations of the London Naval Treaty, these 13 ships had a displacement of 1,850 tons, compared to the 1,500 tons of a "standard" destroyer. When the treaty ended with the outbreak of World War II in Europe in 1939, the much larger Fletcher class was constructed, making the differentiation irrelevant. *South Carolina was the last ship commissioned as a DL type.**Ordered as DLGN, reclassified as CGN prior to commissioning.