Near Wall, South Dakota, this preserved Cold War missile complex safeguards the last intact Minuteman II intercontinental ballistic missile system in the United States, retained in a disarmed state as a record of the nuclear arms race and deterrence. Its key surviving elements, Delta One and Delta Nine, once formed part of a vast southwestern South Dakota missile field operated by the 44th Strategic Missile Wing. Built to endure a Soviet first strike, the missiles here remained on alert for nearly 30 years before removal under the 1991 Strategic Arms Reduction Treaty. The site endures as a rare, tangible reminder of Cold War scale, technology, and tension.