 They had one of the first, if not the first close-in weapon systems (CIWS).The survivability rating was improved to 50%, and the required volley of 12 missiles could be launched by only three ships.Sinking a destroyer was therefore regarded as 'assured' using only six ships (two squadrons of three vessels), making the Project 205 vessels easier to coordinate and even cheaper than would be the required number of Project 183R boats to achieve the same effectiveness.