Three-inch guns before close-in weapon systems

Were US three-inch naval guns in the 1960s and 1970s the precursor to a close-in point-defence system?

They contributed to layered defence, but missiles were the preferred outer defence and chaff and guns were the final fallback before dedicated close-in systems appeared.

The three-inch mount was a general-purpose, middle-tier weapon whose rate of fire filled a gap left by five-inch guns. A ship's missiles provided the preferred outer defence against incoming weapons, with gunfire and chaff available as threats came closer. Later anti-ship missiles reduced the defender's warning and engagement time by flying lower and, in the Shipwreck example, letting one missile rise for a radar update while the rest stayed near the water. That change helped create demand for Sea Wolf-style close defence. The three-inch gun belonged to an evolving layered system rather than serving as a direct equivalent of a later autonomous CIWS.