Patriot missiles were a little sketchy in the beginning but they had a pretty good kill ratio for a bullet hitting a bullet so to speak.
I recall about the smae time frame of the mid to early 80s, i was driving from Las Cruces NM to White Sands over the Organ Mountains. As I crested over the Organ Pass there was a lone MP manning a road block looking out over the valley below. I was the lone driver out that day, so I rolled up and asked him what was happening. He said they are having a missile test that morning. He said it was going to happen at any minute. He pointed to the south towards Ft Bliss and said it would launch from there and fly North towards some target drones. Soon I saw a puff of smoke and heard a loud boom and saw a missile below our position screaming northward about a few hundred feet above the ground. The MP handed me his binoculars and pointed where to look. In a few seconds I saw the single missile split into two separate warheads and took out two separate drones! Whoa!

I had not anticipated that and never heard of such a weapon in use later on. I looked at the MP with a surprised look and he raised an eyebrow and said I could proceed in just a few minutes.