 Complete the following phrase:  Forrestal-class ships were the first examples of supercarriers and thus not quite a perfected design; their elevators in particular were badly arranged for aircraft handling. The portside elevator, a relic of the original axial-deck design, was especially poorly sited, as it was located at the fore end of the angled deck, in the landing path as well as the launch path of aircraft from the No. 3 and No. 4 catapults. The subsequent moved the portside elevator to the aft end of the angle and reversed the position of the island and the second starboard elevator, vastly improving aircraft handling. The sponson-mounted guns suffered from poor range and complicated firing arcs, and were located in very wet and thus nearly useless positions in the bow and stern. They were removed after only a few years and were later replaced by missiles and much later by close-in weapon systems CIWS. The aft guns in Forrestal lasted until the 