#SR72
Science & Technology | Science & Technology
The Hypersonic SR-72 Is Coming: A Mach 6 Monster? | The National Interest
It could be a game-changer.
News | National News
Here's what we know about Lockheed Martin's mysterious SR-72 - Business Insider
In 2013, Lockheed Martin announced development of the the successor to the SR-71 Blackbird spy plane.
