Hypersonic Cruise Missiles Hit Mach 5

Tomahawk Cruise missiles may be known for their pinpoint accuracy, but when it comes to speed, there's no topping the X-51. As part of the Pentagon's Prompt Global Strike project, the X-51 is a hypersonic cruise missile that can strike anywhere in the world in less than an hour. The new missile, which is designed to… » 12/20/06 11:35am 12/20/06 11:35am