The Falcon Hypersonic Test Vehicle 2 (HTV-2)

http://www.bbc.co.uk/news/world-us-canada-14497641

http://www.washingtonpost.com/national/us-defense-agencys-experimental-hypersonic-glider-launched-from-california-base/2011/08/11/gIQAZjeg8I_story.html

http://www.msnbc.msn.com/id/44109301/ns/technology_and_science-space/#.TkU8n3NmJWA

The HTV-2 fells at Mach 17 (21,000km/h). It's awesome! It is launchd by a Minotaur IV rocket. A Minotaur IV rocket is a solid fuel rocket and able to launch it quckly.