National Security Journal on MSN

Sorry, B-21 Raider: Mach 3.08 XB-70 Valkyrie bomber has a message for the US Air Force

Mach 3.08 At 74,000 Feet: The XB-70’s Peak Moment Summary and Key Points: The lone surviving XB-70 Valkyrie—North American’s ...
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 ...