Shachtman, N., Hypersonic Cruise Missile: America's New Global Strike Weapon, Popular Mechanics, Jan 2007
The mission: Attack anywhere in the world in less than an hour. ...
... the X-51 hypersonic cruise missile, which is designed to hit Mach 5 — roughly 3600 mph. The goal, according to the U.S. Strategic Command's deputy commander Lt. Gen. C. Robert Kehler, is "to strike virtually anywhere on the face of the Earth within 60 minutes."
Of the Aerospike Engines, I believe that the toroidal is probably used for a cruise missile while the linear is used for a single-stage-to-orbit experimental aircraft.
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