Advocates argue that non-nuclear Conventional Prompt Global Strike (CPGS) weapons could be used to counter antisatellite weapons or sophisticated defensive capabilities, deny a proliferator the ability to employ his weapons, and kill high-value terrorists. Critics worry that CPGS weapons could create serious strategic risks, most notably of conflict escalation. In this report, the Carnegie Endowment for International Peace reflects on the development of hypersonic long-range conventional weapons, usually defined as those operating at Mach 5 or above, with a range of 1,500 km.
http://carnegieendowment.org/files/cpgs.pdf

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