They didn't have the advanced technology then to really implement it. It was more of a seed program and a provocation to get the Russians spending money they didn't have in a new arms race. Lasers and EMP weapons have come a long ways since. I believe some are even operational now, at least groundside.<quoted text>
It failed on cost.
It failed in research and development
It failed politically
It did have some benefits to advancing science although the actual aim of the majority of the project(s) was never reached.
Or perhaps I am wrong and the US is now benefiting from an iron ring of technologically advanced protective weaponry? Such a shame the cold war is long over and you are wasting all those tax dollars and a redundant system?
Militarily you always seek the higher ground. Plus you are starting a planetary defense against possible extra-terrestial threats, be they rocks or entities.