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概括了美国液体和固体燃料冲压发动机及管道火箭技术的发展。评述了这项技术在实用性武器系统，主要是美国海军黄铜骑士和空军波马克面对空导弹系统中的应用。讨论了空中发射导弹冲压发动机技术的发展和有关飞行试验的结果。这些后来的计划主要侧重于美国整体式助推器概念和突胀燃烧系统的发展。在执行这些导弹系统计划时，还对高能硼燃料的高超音速超燃冲压发动机进行了广泛研究。但这些研究和发展工作一直受到美国政府研究经费周期性涨落的影响。先进空对空导弹管道火箭推进系统在经过８０年代末和９０年代初的广泛发展之后，现在又面临国防部投资的不稳，已为这种技术奠定的一点点工业基础都可能会消失。与世界各国再次醒悟到需要用这种推进技术提供超高性能的成熟系统而正在展开工作相比，美国却显得无动于衷。
Summarizes the development of liquid and solid fuel ramjet engines and pipe rocket technology in the United States. Commented on the application of this technology in practical weapon systems, mainly the US Navy Brass Knights and the Air Force Bomak AAF. The development of air-launched missile-stamped engines and the results of flight tests are discussed. These later plans focused primarily on the concept of an integral booster in the United States and the development of an incipient combustion system. In the implementation of these missile system programs, extensive research has been conducted on high-energy boron-fuel hypersonic scramjet engines. However, these research and development efforts have been affected by the cyclical fluctuations in the research funding of the U.S. government. After widespread development of the advanced air-to-air missile pipeline rocket propulsion system in the late 1980s and early 1990s, the investment in the Ministry of Defense is now again destabilized, and the little industrial base that has been laid for such technology may disappear. The United States has remained indifferent to the ongoing work of other countries around the world that is once again realizing that sophisticated systems that require ultra-high performance with this propulsion technology are working.