National Security Journal on MSN

The Mach 6.7 monster: Why the X-15’s speed record still stands in 2026

Summary and Key Points: The X-15 program, spanning 199 flights between 1959 and 1968, pushed the boundaries of aeronautics ...
National Security Journal on MSN

The SR-72 Darkstar Mach 6 'bomber' has a message for the US Air Force

Summary and Key Points: As of February 2026, the SR-72 “Darkstar” remains a high-value Skunk Works concept rather than a formal bomber program. -While the allure of a Mach 6 striker is immense, ...