The two facilities are the last of the 321st Missile Wing, a cluster of intercontinental ballistic missile launch sites that were spread over a 6,500-square-mile (17,000 km) area around the Grand Forks Air Force Base. These facilities played a major part in how the United States responded to the training and testing of responding to a nuclear threat. The Oscar-Zero Site is the last launch control center intact for the public to visit, along with the top-side access to November 33 missile facility.^[1]

• http://en.wikipedia.org/wiki/Ronald Reagan Minuteman Missile State Historic Site