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The Apollo 11 capsule with the X-15 overhead. To the left the Pershing-II and SS-20 missiles exhibited here are two of more than 2,600 nuclear missiles banned by the Intermediate-range Nuclear Forces (INF) Treaty, which was signed by the United States and the Soviet Union in December 1987. The INF Treaty is a milestone in the effort to control nuclear arms. It is the first international agreement to eliminate an entire class of nuclear weapons--those having a range of 500-5,500 kilometers (300-3,400 miles). The U.S. Pershing-II and the Soviet SS-20 were regarded as the most threatening missiles in this class.

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