 The three "Chester"s were the US Navy's only ships to be commissioned with the "scout cruiser" (hull classification symbol non-standard at the time, CS or SCR are sometimes used) designation, and were characterized by high speed and little armor or armament.They were also the last cruisers of any type built for the US Navy until the first cruisers were laid down in 1917 (the Navy concentrated on building dreadnought battleships and destroyers in the interim).The first three "Omaha"-class ships were also designated "scout cruisers" (CS or SCR) when ordered, but before any were launched the Navy revised its classification system and they and the "Chester"s became "light cruisers" (CL).