We hear of the second test of this "unmanned hypersonic vehicle". Actually ICBMs will go this fast above the atmosphere. This is really just intended to be a low-flying hypersonic cruise missile that can fly below the radar. It's a great way to void a missile defense.
Of course, that isn't what DARPA calls it. It's what I call it. Another $500 million or so of your tax dollars that the republicans aren't going to cut off to the defense industry.
Then there's always the peacetime applications of your basic war on Terra tech. [tip o' the tinfoil to Cryptogon]