The Air Force has revived hypersonic sled testing, dormant for 18 years, in order to add another means to the limited portfolio of hypersonic test capabilities. Sled tests at Holloman Air Force Base, N.M., demonstrated that hypersonic speeds can be achieved on a test track ...
The first B-21 expected to fly is largely assembled and has been moved to a calibration facility, one of the last steps before powering systems and making final checks ahead of first flight, Rapid Capabilities Office director Randall Walden reported.