用于导弹防御或防御来自苏联对易被攻击的美国宇宙飞行器袭击的定向能武器——高能激光和粒子束,是白宫、国防部和议会日益关注的中心。若干因素促成了把注意力集中于发展用于定向能武器的技术。它们是: For the missile defense or defensive weapons from the Soviet Union to the attack on vulnerable U.S. space vehicles - high-energy laser and particle beam, the White House, Department of Defense and the increasingly concerned center of parliament. Several factors have led to a focus on the development of technology for directed weapons. They are: