The DARPA Falcon Project is a two-part joint project between the Defense Advanced Research Projects Agency and the United States Air Force. One part of the program aims to develop a reusable, rapid-strike Hypersonic Cruise Vehicle, and the other is for the development of a launch system capable of accelerating a HCV to cruise speeds, as well as launching small satellites into earth orbit. This two-part program was announced in 2003 and continued into 2006. The latest project to be announced under the Falcon banner was a fighter-sized unmanned aircraft called "Blackswift" which would take off from a runway and accelerate to Mach 6 before completing its mission and landing again. The memo of understanding between DARPA and the USAF on Blackswift also known as the HTV-3X was signed in September 2007. The Blackswift HTV-3X did not receive needed funding and was canceled in October 2008.

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