Dense Pack is a strategy for basing intercontinental ballistic missiles (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 missiles during the final decade of the Cold War. It was never used; MX was deployed in existing silos and then removed from service as the Cold War ended.