Roamy here. We need some new names in aerospace, because the first thing I thought of when I heard about the HTV-2 was the Japanese unmanned cargo vehicle (aka Kounotori). Didn’t help that they also called it Falcon, which is same as the SpaceX rocket. Anyway, I digress…
The Lockheed Martin-built HTV-2 was supposed to fly over 4,000 miles across the Pacific in 30 minutes, demonstrating hypersonic flight and developing technology for a global strike weapon. The first test flight in April 2010 lasted for nine minutes before telemetry was lost. Today, DARPA said the launch from Vandenberg AFB of the Minotaur 4 rocket carrying the HTV-2 was successful, separation was confirmed, and that it was entering glide phase. It reported 26 minutes later that telemetry had been lost. I hope they received enough data to know what went wrong.
A little more about the HTV-2 test here.