The earliest of the US Navy’s anti-aircraft missiles is the “terrier.” The terrier is the missile that was the basis of the later standard missiles. Since Standard is still the front line as the current fleet air defense missile, the descendants of Terrier are still used.
Due to the large scale of the terrier system, it was installed using existing cruisers. First, the Baltimore-class heavy cruiser was refurbished and equipped with a terrier to become the Boston-class. It was this Providence class that was subsequently refurbished. The Boston-class refurbishment was the minimum necessary refurbishment, “the first half of the ship is almost the same, and the second half of the ship is a terrier system.” However, in the Providence class, the first half of the ship and the bridge have also changed significantly.