Congratulations on a successful test flight. Aircraft that fly up to Mach 10 can still use radio communication. That wasn't the case with the Falcon Project's HTV-2. I guess the Air Force wants a GPS-guided hypersonic cruise missile.
Past Mach 10, a layer of plasma is formed on the leading surface of the aircraft, which RF cannot traverse. This is also why atmospheric reentry occurs in a blackout. There's a good explanation of the phenomenon here:
