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Falcon Hypersonic Technology Vehicle-2 crashes on second test flight
SimplePlanes Falcon HTV 2
Mach 20 or Bust, Air & Space Magazine
US Military close to developing Hypersonic bombers
Avion hypersonique américain : seconde perte au-dessus du Pacifique
Lockheed Is Planning to Build a Mach 6 Warplane
DARPA's Falcon Hypersonic Technology Vehicle 2 (HTV 2) Test Flight Profile
HTV-2 - Defense Update
Falcon HTV-2 is lost during bid to become fastest ever plane, US military
US military researchers lose contact with hypersonic plane
Falcon Hypersonic Technology Vehicle
Figure 1 from Materials Development for Hypersonic Flight Vehicles