Thirty-one ships (DE-1052–1069 and 1071–1083) were fitted with an eight-round Basic Point Defence Missile System (BPDMS) launcher for RIM-7 Sea Sparrow missiles in place of the cancelled Sea Mauler short range surface to air missile system, while was fitted with a NATO Sea Sparrow (IBPDMS) launcher. It was planned to equip the other 14 ships with Sea Chaparral, based on the Sidewinder air-to-air missile, but this plan was abandoned. Most ships were refitted with a Phalanx CIWS aft during the 1980s, replacing the Sea Sparrow launcher.