Hyper! Sonic!
By 
The Cipher Brief asked me for some thoughts on hyper-sonic weapons:
In recent years, defense analysts have increasingly turned their attention to the development of hypersonic weapons, a class of systems intended to strike fast, at range, and evade most existing defenses. Generally speaking, a hypersonic weapon is a system in which the kill vehicle (carrying the warhead) travels in excess of Mach 5 in its terminal phase, just prior to striking its target.