In early December 1955, the phone rang at an air base in Colorado Springs. The officers on the watch floor of the Continental Air Defense Command (CONAD) – who were defending the skies above the US and Canada – stiffened.

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In early December 1955, the phone rang at an air base in Colorado Springs. The officers on the watch floor of the Continental Air Defense Command (CONAD) – who were defending the skies above the US and Canada – stiffened.