Missile Defense Alarm System (Midas): Any of a series of unmanned U.S. military satellites developed to provide warning of surprise attacks by Soviet intercontinental Ballistic missiles (ICBM).

 
  • 飞弹防御警报系统:一系列无人操作的美国军事卫星,发展目的在于提供苏联洲际弹道飞弹突袭的警报。
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