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地基中段防御系统(GMD)是美国一体化反导系统的重要组成部分,旨在防御美国本土可能遭受的洲际弹道导弹袭击。地基拦截弹(GBI)是GMD系统中的拦截武器,由助推火箭和外大气层杀伤拦截器(EKV)组成。目前,美国已经部署了30枚GBI,其中4枚部署在范登堡空军基地,26枚部署在阿拉斯加的格里利堡。按照目前的计划,到2017年GBI的数量将达到44枚。根据美国国防部作战试验与评估
The ground-based mid-section defense system (GMD) is an important part of the United States integrated anti-missile system and aims to protect against possible intercontinental ballistic missile attacks on the United States. Ground-based interceptors (GBIs) are interceptor weapons in the GMD system and consist of booster rocket and outer atmosphere kill interceptor (EKV). Currently, the United States has deployed 30 GBIs, of which 4 are deployed at Vandenberg Air Force Base and 26 at Fort Greely in Alaska. According to the current plan, the number of GBIs will reach 44 by 2017. According to the U.S. Department of Defense operational tests and assessments