“The weapons required included space- and ground-based nuclear X-ray lasers, subatomic particle beams, and computer-guided projectiles fired by electromagnetic rail guns—all under the central control of a supercomputer system.” By using these systems, the United States planned to intercept intercontinental ballistic missiles while they still flew high above the Earth, minimizing their effects. However, there was a large power requirement for these types of weapons — power requirements so vast that nuclear power was the method of choice. Thus, as the reality of creating numerous nuclear plants diminished, so did the ambitious designs. By the end of SDI, the primary focus of the weapons design group was focused on “land based kinetic energy weapons.” These weapons were essentially guided missile projectiles. At the end of the Strategic Defense Initiative, thirty billion dollars had been invested in the program and no laser and mirror system was ever used, not on land, not in space. The Strategic Defense Initiative was eventually abandoned, and after a few years, it was nothing other than a short chapter in history books.