National Security Journal on MSN

The Mach 6 SR-72 Darkstar ‘Scramjet’ Has a Message for the U.S. Air Force

The secretive SR-72 “Darkstar” is Lockheed Martin’s ambitious project to build a Mach 6+ hypersonic ISR and strike aircraft. ...
National Security Journal on MSN

The Mach 9.6 X-43A ‘Hypersonic Scramjet’ Has a Message for the U.S. Air Force

Key Points and Summary – NASA’s X-43A wasn’t a paper study—it was a 12-foot, hydrogen-fueled experimental jet that proved an ...