Over the last 25 years the United States has become increasingly dependent on space-based systems to support its military forces, and this trend is likely to continue for some time. Satellite systems have become an
integral part of nuclear deterrence by providing strategic warning of an
attack, tactical warning of missile launches, reliable communications between command authorities and nuclear forces, and nuclear explosion detection. Satellites also aid in conventional war-fighting by providing
accurate reconnaissance, intelligence, weather, and navigation information