Light Cuisers of US Navy

In the 1920 hull designation system, of the Third Class Cruisers the fast Scout Cruisers became Light Cruisers (CL), and the slower New Orleans and Denver-class "peace cruisers" were reclassified Patrol Gunboats (PG).

On 8 August 1921 the system was revised; the surviving protected cruisers (except for the "semi-armored" St Louis class) and the peace cruiser/patrol gunboats were all grouped with the scout cruisers as Light Cruisers (CL).

Source: List of cruisers of the United States Navy on Wikipedia, the free encyclopedia