
Dense Pack is a strategy for basing intercontinental ballistic missiles, or ICBMs, for the purpose of maximizing their survivability in case of a surprise nuclear first-strike on their silos conducted by a hostile foreign power. The strategy was developed under the Reagan administration as a means of safeguarding America`s inventory of MX missile....
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http://en.wikipedia.org/wiki/Dense_Pack

(from the article `fortification`) ...nuclear explosions cannot occur at the same time in close proximity to one another because the first detonated warhead triggers low-yield partial ...
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http://www.britannica.com/eb/a-z/d/31
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