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1984年6月10日格林威治时间11时26分,在太平洋100公里高的上空,美国用一个致命的‘伞’拦截并摧毁了一个飞来的弹道导弹弹头。 弹头是空的。‘伞’是原型的非核拦截弹。将来美国的弹道导弹防御系统要以这种拦截弹为基础。这项导致用一个弹头成功地摧毁另一个弹头的计划就是美国陆军耗资三亿美元的上层寻的实验（HOE）。 HOE的目的是验证在地球大气层外（所以称为大气层外防御）用非核手段拦截弹道导弹弹头的可行性。洛克希德导弹和空间公司为美国陆军设计和研制了这种拦截弹,它又称作寻的和摧毁级。
At 1126 hours on 10 June 1984, at 1005 GMT, the United States intercepted and destroyed a flying ballistic missile warhead with a deadly “umbrella” over the Pacific Ocean. Warhead is empty. ’Umbrella’ is a prototype non-nuclear interceptor. In the future, the U.S. ballistic missile defense system will be based on such interception missiles. The plan to successfully destroy another warhead with one warhead is the U.S. Army’s $ 300 million Upper Expedition (HOE). The purpose of the HOE is to verify the feasibility of intercepting ballistic missile warheads with non-nuclear means outside the Earth’s atmosphere (so-called extra-atmospheric defenses). The Lockheed Missile and Space Company designed and developed the interceptor for the United States Army, which is also known as the Seeking and Destroying Class.