 In January 1945, removal of two quadruple torpedo tubes was authorized to permit substitution of two 40 mm quad mounts. In June, removal of the third centerline tube was authorized to make way for two 40 mm twin mounts abreast of the aft stack. All ships receiving these AA modifications were to have directors installed with their new 40 mm mounts; these Mark 51s were to be replaced by new blind-firing GFFC Mark 63 installations with radar.
