The Hercules was also equipped with a small nuclear warhead itself in order to stop a nuclear attack. W-31 was carried in an arm of the warhead in different sizes and could destroy aircraft clusters. In addition to the warhead was a significant upgrade in the guidance system making it more precise at far away targets.
The Hercules was reported as well as all the Ajax missiles to be disbanded in 1974 although there are many reports that the military still used the rockets through part of the 1980s. The missiles were considered at the time a surplus whereas the government deemed them costly. Nike missiles are still deployed by other countries in Europe and Asia.
The monument erected in Pennsylvania is little more than a statue to a once powerful program for the US government during the Cold War. Very few sites were the missiles could be launched are still intact.