It was found that, while it was possible to mass-produce nuclear-powered warships, the ships were less cost-efficient than conventionally powered warships. Also, the new gas turbine–powered ships then entering the fleet—the s—required much less manpower. While eleven ships of the "Virginia" class were planned, only four were produced and the remainder were cancelled. Following the completion of the final member of the class, "Arkansas", the U.S. Navy continued conventional destroyer/cruiser production, and it re-designated the DDG-47 class of guided missile destroyers as the CG-47 s.