 Finally in 1954 they were redesignated one last time, gaining hull numbers "MS 471" to "475" and "MS 481" to "484".The vessels were at the orders of the COMOS ("Comando Siluranti") together with the more numerous ex-American PT boats.At this time the two surviving series 1 CRDAs were upgraded to series 2 specifications, gaining the rear 450 mm torpedo launchers.