美国的国家导弹防御系统是一种战略导弹防御系统,美国政府将其限定在对付“捣乱国家”少量的弹头对美国本土威胁上。由于受到美、苏《限制反弹道导弹系统条约》的限制,美国对战略导弹防御系统的研究一直是遮遮掩掩。然而到了1996年,美国认为其本土遭受战略弹道导弹袭击的可能性越来越大,因而需要部署战略导弹防御系统。同年美国弹道导弹防 The U.S. national missile defense system is a strategic missile defense system and the U.S. government limits it to the threat posed to the United States by a small number of warheads that “disrupt the country.” Due to the U.S.-Soviet restrictions on the ABM Treaty, the United States’ study of the strategic missile defense system has been obscure. However, by 1996, the United States believed that its own territory was more and more likely to be hit by strategic ballistic missiles and that it needed to deploy a strategic missile defense system. The same year, the United States ballistic missile defense