It was determined to be vulnerable to land born attack.
Now it makes sense. In the 1980 overhaul they installed three Phalanx 20mm machine guns or to describe it better an electronic high speed Gatling Guns system. I saw it working on an out and back in shakedown over nighter we took right before I got out. It was one wicked weapon to behold. The turret could move faster than human eyes could follow. I imagine it could hit land or small craft targets just as easy. That added a lot more to the ships self defense capacities.