The US Air Force's aims with each X-37B mission continue to be shrouded in secrecy, but we're learning a little more now that it has launched the autonomous space plane for a third time. In once more flying the OTV-1, the original vehicle that reached orbit in 2010, the military branch is clear that testing reusability is a major goal: it wants to know if these spacecraft can take more than one trip without suffering ill effects. We likewise know that n
