Not really military related per se, but it seems Stratolaunch is planning a hypersonic rocket powered drone called the Talon-A. More of which can be read about on Stratolaunch's offical page for the project . I am not an expert, but the concept reminds me of the Chinese WZ-8 supersonic drone, though obviously with a much higher speed (Mach 6 vs. Mach 3). Given the stated goals of this program, you have to wonder if it will be adopted for the US Air Force.