In 2004 a twelve-foot unmanned NASA aircraft hit Mach 9.6 and set an air-breathing speed record that still stands today — then America cancelled the Mach 15 machine meant to come next and spent twenty years watching Russia and China field the hypersonic weapons it walked away from

In 2004 a twelve-foot unmanned NASA aircraft hit Mach 9.6 and set an air-breathing speed record that still stands today — then America cancelled the Mach 15 machine meant to come next and spent twenty years watching Russia and China field the hypersonic weapons it walked away from – Space