At around 3600 Miles per hour the X-51 will reach Mach 5 and can hit any place on earth in under an hour.
The need for fast action is sure to arise in the near future, says the american military, with rumors of north korea planning a nuclear launch and biotoxins being stockpiled in Lebanon.
Tomahawk missiles are too slow. In 1998 the USS Abraham Lincoln Battle group launched Tomahawk cruise missiles at confirmed Intel location of al qaeda training strongholds and a possible Osama bin laden location.
The missiles were launched in the Arabian Sea from a Warship and flew 1100 miles to, Which took very close to 2 hours, and according to Richard Clarke, former leader of counter terrorism
in the U.S., they missed Ossama by under an hour. the X-15 would of had time to spare.
Unlike many ground missiles the Hypersonic X-51 missile will be launched from a B-52 Jet plane and boosted to supersonic speeds by a rocket and then hyper accelerated to hypersonic speed by a scram jet system.
With a 60 million dollar project budget the X51 should be in a war near you in no time
Diagram of the components of the X-51 Hypersonic cruise missile