There was also the Safeguard missile defense complex. It was decommissioned in 1976 after being operational for just a few months. Probably would not have been very effective.
https://en.wikipedia.org/wiki/Stanley_R._Mickelsen_Safeguard_Complex
Aside from it being deliberately limited, I seem to recall the Sprint missiles it was supposed to control not generally being guidable due to commo problems caused by the plasma envelope around it and they were working on a fix for the problem when it got canned, and the Spartan missiles it also controlled just not working (not in the sense that they wouldn’t fly, because they did) due to a flawed concept. I didn’t count it in workable ABM systems because I don’t think it ever actually worked as planned.