The Stanley R. Mickelson Safeguard complex in Nekoma, North Dakota, with the separate long-range detection radar located further north at Concrete, North Dakota , was the only operational anti-ballistic missile system ever deployed by the United States. It defended Minuteman ICBM silos near Grand Forks, North Dakota.
It had reinforced underground launchers for thirty Spartan and sixteen Sprint missiles (an additional fifty or so Sprint missiles were deployed at four remote launch sites). The complex was deactivated in 1976 after being operational for less than four months.
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The international safeguards system is a system of treaties and inpections administered and conducted by the IAEA to hinder nuclear weapons proliferation.