# DARPA Falcon Project
The DARPA Falcon Project, formally FALCON (Force Application and Launch from CONUS), was a joint program of the Defense Advanced Research Projects Agency and the [United States Air Force](https://www.edgepedia.org/united-states-air-force), initiated in 2003, to develop technologies for prompt global strike from the continental United States and for low-cost, responsive small launch vehicles.[1](https://www.globalsecurity.org.globalsecurity.org/space/systems/falcon.htm) Its best-known hardware, the Falcon Hypersonic Technology Vehicle 2 (HTV-2), was an unmanned, rocket-launched, maneuverable glider designed to fly through the upper atmosphere at Mach 20, about 13,000 miles per hour, and it flew twice, in 2010 and 2011, before the program ended.[2](https://www.darpa.mil/about/innovation-timeline/falcon-htv-2)
| Key fact | Detail |
|---|---|
| Full name and sponsors | Force Application and Launch from CONUS (FALCON), jointly sponsored by DARPA and the U.S. Air Force, begun in 2003[1](https://www.globalsecurity.org.globalsecurity.org/space/systems/falcon.htm) |
| Three vehicle lines | A Small Launch Vehicle (SLV), a Common Aero Vehicle (CAV, later renamed Hypersonic Technology Vehicle), and a Hypersonic Cruise Vehicle (HCV)[3](https://www.congress.gov/108/chrg/CHRG-108hhrg92514/CHRG-108hhrg92514.pdf) |
| SLV goal | Place a 1,000-pound payload into low Earth orbit for less than $5 million per launch[4](https://www.gao.gov/assets/gao-08-516.pdf) |
| HCV goal | A hypersonic glide plane capable of delivering 12,000 pounds over 9,000 miles[3](https://www.congress.gov/108/chrg/CHRG-108hhrg92514/CHRG-108hhrg92514.pdf) |
| HTV-2 speed | Mach 20, approximately 13,000 mph; New York to Los Angeles in under 12 minutes at that speed[2](https://www.darpa.mil/about/innovation-timeline/falcon-htv-2) |
| Flight tests | Maiden flight April 22, 2010 (nine minutes of data); second and final flight August 11, 2011, lost contact nine minutes into a planned 30-minute flight[2](https://www.darpa.mil/about/innovation-timeline/falcon-htv-2) • [5](https://spaceref.com/status-report/darpa-hypersonic-vehicle-splashdown-confirmed/) |
| Program end | The program ended in 2011 after the second flight failure[6](https://www.everycrsreport.com/reports/R45088.html) |
## Origins and goals
DARPA and the Air Force designed FALCON around the idea that one common set of technologies could be matured incrementally to serve both a near-term capability for prompt global strike from the continental United States and a far-term reusable Hypersonic Cruise Vehicle.[1](https://www.globalsecurity.org.globalsecurity.org/space/systems/falcon.htm) A 2004 congressional testimony described the program as developing three elements: a Small Launch Vehicle, a Common Aero Vehicle glide body, and a Hypersonic Cruise Vehicle, with an initial goal of a rocket-boosted glide vehicle delivering 1,000 pounds to a distance of 3,000 miles and a matured goal of 12,000 pounds over 9,000 miles.[3](https://www.congress.gov/108/chrg/CHRG-108hhrg92514/CHRG-108hhrg92514.pdf) The ultimate prompt global reach vision was a reusable HCV able to fly 9,000 nautical miles in two hours.[1](https://www.globalsecurity.org.globalsecurity.org/space/systems/falcon.htm)
**Renaming and descope.** In 2008, lawmakers established the Conventional Prompt Global Strike program to advance some of the technology originated by FALCON, focused on an intercontinental-range hypersonic glider known as HTV-2.[8](https://www.cbo.gov/publication/58924)
## Small Launch Vehicle
The SLV line sought a launcher able to place a 1,000-pound payload into low Earth orbit for less than $5 million, with an operational cost basis of 20 flights per year for 10 years.[4](https://www.gao.gov/assets/gao-08-516.pdf) In May 2003 DARPA released a Phase 1 solicitation, received 24 proposals, and awarded nine six-month study contracts; in September 2004 contracts went to AirLaunch LLC, Lockheed Martin, Microcosm, and SpaceX, with AirLaunch and SpaceX continuing past the preliminary design gate.[9](https://ntrs.nasa.gov/api/citations/20060048219/downloads/20060048219.pdf)
**SpaceX connection.** Rather than procuring launch vehicle development from SpaceX, DARPA procured a launch of a government payload from the Reagan Test Site; the NASA history notes it is a coincidence that SpaceX's Falcon 1 shares the name of the DARPA-managed Falcon program.[9](https://ntrs.nasa.gov/api/citations/20060048219/downloads/20060048219.pdf) Between fiscal years 2003 and 2007, DARPA provided SpaceX more than $15.6 million for advanced technology development, facilities, test-range and mission support, and program office support.[4](https://www.gao.gov/assets/gao-08-516.pdf) DARPA's timeline page also credits the program's booster context with SpaceX's Falcon 9 being certified in 2011 to launch highly valuable Department of Defense payloads, the first commercial vendor for such a service, with DARPA as the company's first customer for launch from a DoD site.[2](https://www.darpa.mil/about/innovation-timeline/falcon-htv-2)
**AirLaunch.** The other continuing contractor pursued the QuickReach booster, designed to be released from an unmodified C-17 cargo aircraft. On July 27, 2006, a team from the 412th Test Wing, DARPA, and AirLaunch dropped a full-scale simulated QuickReach rocket weighing 72,000 pounds from a C-17, a record for the largest single object dropped from the type, under the joint Falcon SLV program.[10](https://www.aftc.af.mil/News/On-This-Day-in-Test-History/Article-Display-Test-History/Article/2243112/july-27-2006-small-launch-vehicle-program-breaks-record/)
## The HTV-2 glider and its two flights
Falcon HTV-2 was an unmanned, rocket-launched, maneuverable aircraft that glided through the atmosphere at Mach 20, described by DARPA as a "data truck" carrying numerous sensors to collect data in an uncertain operating envelope. DARPA identified three key technical challenges for long-duration hypersonic flight: aerodynamics, aerothermal effects, and guidance, navigation, and control.[2](https://www.darpa.mil/about/innovation-timeline/falcon-htv-2) Both flights launched from Vandenberg Air Force Base aboard Orbital Sciences Minotaur IV Lite rockets, which used decommissioned [Peacekeeper ICBM](https://www.edgepedia.org/lgm-118-peacekeeper) motors.[11](https://www.stratcom.mil/Media/News/News-Article-View/Article/983777/air-force-prepares-to-launch-darpa-hypersonic-vehicle/)
The maiden flight on April 22, 2010 collected nine minutes of unique flight data, including 139 seconds of Mach 22 to Mach 17 aerodynamic data, and achieved firsts including maintaining [GPS signals](https://www.edgepedia.org/gps-signals) while traveling 3.6 miles per second and validating two-way communication with the vehicle.[2](https://www.darpa.mil/about/innovation-timeline/falcon-htv-2) Engineers attributed the first-flight anomaly to flight control authority limitations: at more than 10,000 mph near the edge of space, the control flaps could not maintain the vehicle's attitude, causing yaw and roll before the craft autonomously terminated the flight.[12](https://www.spaceflightnow.com/news/n1108/11minotaurhtv2b/)
**Second flight.** Following an independent Engineering Review Board, engineers adjusted the vehicle's center of gravity, decreased its angle of attack, and augmented the flaps with reaction control system thrusters.[5](https://spaceref.com/status-report/darpa-hypersonic-vehicle-splashdown-confirmed/) The second flight, on August 11, 2011, demonstrated stable, aerodynamically controlled Mach 20 flight for approximately three minutes before an anomaly; onboard systems detected unsafe flight behavior and commanded a controlled descent into the ocean, and contact was lost nine minutes into the planned 30-minute flight.[5](https://spaceref.com/status-report/darpa-hypersonic-vehicle-splashdown-confirmed/) • [13](https://ntrs.nasa.gov/api/citations/20110013662/downloads/20110013662.pdf) DARPA stated the Flight 2 anomaly appeared unrelated to the Flight 1 anomaly.[5](https://spaceref.com/status-report/darpa-hypersonic-vehicle-splashdown-confirmed/) The program ended in 2011.[6](https://www.everycrsreport.com/reports/R45088.html)
## What the flights produced
Despite the losses, the flights changed hypersonic design practice. Air Force Maj. Chris Schulz, the HTV-2 program manager, said the first flight corrected aerodynamic models for the flight regime, and data from the second flight revealed new knowledge about thermal-protective material properties and uncertainties for Mach 20 flight inside the atmosphere.[14](https://www.esd.whs.mil/Portals/54/Documents/FOID/Reading%20Room/DARPA/14-F-0122_DARPA_X-51_DOCUMENTS.pdf) The shortened first flight still gathered more useful data than could have been efficiently collected in ground wind tunnels, which can simulate long-term hypersonic conditions only up to about Mach 15.[12](https://www.spaceflightnow.com/news/n1108/11minotaurhtv2b/)
The HTV-2 data also entered later analysis: the [Congressional Budget Office](https://www.edgepedia.org/congressional-budget-office) modeled the glide phase of current boost-glide missile options starting from an earlier analysis of the HTV-2 test and used the HTV-2 burnout speed of 6 km per second as one of its modeling values.[8](https://www.cbo.gov/publication/58924)
## Legacy
The HTV-2 line evolved into DARPA's Tactical Boost Glide (TBG) program, a joint DARPA/Air Force effort begun in 2014 that explicitly exploited the technical knowledge and lessons from HTV-2 development and flight testing; the TBG vehicle in turn forms the basis for the Air Force's Air-Launched Rapid Response Weapon (ARRW).[15](https://www.darpa.mil/research/programs/tactical-boost-glide) • [8](https://www.cbo.gov/publication/58924) The Air Force's later hypersonic effort derives foundational requirements from the early FALCON HTV-2 program, including reaching Mach 5, launching in under two hours, striking targets in under one hour, and maintaining a maneuverable flight path after booster separation.[16](https://www.afpc.org/uploads/documents/Hypersonic_Weapons_Primer_-_July_2019_%28web%29.pdf) Within DARPA's broader record, the Falcon HTV-2 failures are cited as an example of the agency's tolerance for high-risk, high-reward research that sometimes fails to meet expectations.[6](https://www.everycrsreport.com/reports/R45088.html)
## References
1. [Force Application and Launch from CONUS (FALCON), GlobalSecurity.org](https://www.globalsecurity.org.globalsecurity.org/space/systems/falcon.htm)
2. [Falcon HTV-2, DARPA Innovation Timeline](https://www.darpa.mil/about/innovation-timeline/falcon-htv-2)
3. [NASA–Department of Defense Cooperation, hearing before the House Science Committee (2004), Congress.gov](https://www.congress.gov/108/chrg/CHRG-108hhrg92514/CHRG-108hhrg92514.pdf)
4. [GAO-08-516, Space Acquisitions: DOD Is Making Progress to Rapidly Deliver Low Cost Space Capabilities](https://www.gao.gov/assets/gao-08-516.pdf)
5. [DARPA Hypersonic Vehicle Splashdown Confirmed, SpaceRef (August 14, 2011)](https://spaceref.com/status-report/darpa-hypersonic-vehicle-splashdown-confirmed/)
6. [Defense Advanced Research Projects Agency: Overview and Issues for Congress, CRS Report R45088](https://www.everycrsreport.com/reports/R45088.html)
7. [Conventional Prompt Global Strike and Long-Range Ballistic Missiles: Background and Issues, CRS Report R41464](https://www.everycrsreport.com/reports/R41464.html)
8. [U.S. Hypersonic Weapons and Alternatives, Congressional Budget Office](https://www.cbo.gov/publication/58924)
9. [Brief History of the Falcon Program, NASA NTRS (2006)](https://ntrs.nasa.gov/api/citations/20060048219/downloads/20060048219.pdf)
10. [July 27, 2006: Small Launch Vehicle Program Breaks Record, Air Force Test Center](https://www.aftc.af.mil/News/On-This-Day-in-Test-History/Article-Display-Test-History/Article/2243112/july-27-2006-small-launch-vehicle-program-breaks-record/)
11. [Air Force Prepares to Launch DARPA Hypersonic Vehicle, U.S. Strategic Command (August 9, 2011)](https://www.stratcom.mil/Media/News/News-Article-View/Article/983777/air-force-prepares-to-launch-darpa-hypersonic-vehicle/)
12. [Outcome of military's hypersonic test flight unclear, Spaceflight Now (August 11, 2011)](https://www.spaceflightnow.com/news/n1108/11minotaurhtv2b/)
13. [A Vision of Quantitative Imaging Technology for Validation of Advanced Flight Technologies, NASA NTRS (AIAA 2011-3325)](https://ntrs.nasa.gov/api/citations/20110013662/downloads/20110013662.pdf)
14. [DARPA X-51 documents collection, WHS FOIA reading room (HTV-2 Engineering Review Board material)](https://www.esd.whs.mil/Portals/54/Documents/FOID/Reading%20Room/DARPA/14-F-0122_DARPA_X-51_DOCUMENTS.pdf)
15. [Tactical Boost Glide (TBG), DARPA](https://www.darpa.mil/research/programs/tactical-boost-glide)
16. [Hypersonic Weapons Primer, American Foreign Policy Council (July 2019)](https://www.afpc.org/uploads/documents/Hypersonic_Weapons_Primer_-_July_2019_%28web%29.pdf)
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*Topic: Encyclopedia › Technology and the built world › Transport and spaceflight › Aviation › Aircraft › Experimental and advanced aircraft › Hypersonic and advanced-concept aircraft › Hypersonic programs and vehicles*
*Initially written Sep 17, 2026 · Reviewed: Oct 15, 2026 · Edited: Oct 15, 2026 · Last review: Oct 15, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license