I think it's reasonable to speculate that the air force is already carrying out live tests. The reason for this is that NASA went through a substantial amount o

I think it's reasonable to speculate that the air force is already carrying out live tests. The reason for this is that NASA went through a substantial amount of effort to trial and test the EM drive to their greatest ability, and it came out on top with everything they could throw at it. And it's just been a black out since then. That was about 1.5 years ago. In the interim the air force has sent up the classified X-37 [1]. They've stated it's mission purpose is "risk reduction, experimentation, and operational concept development for reusable space vehicle technologies, in support of long-term developmental space objectives". That's certainly a horoscope style description, but at the same time it does seem to fit quite well for live testing of propellantless drives, even if not as a primary mission. Furthermore, if the EM-drive did work, it would have a beyond revolutionary impact on everything and so it would not be surprising that it would end up getting classified after passing the initial slew of tests thrown at it. [1] - https://en.wikipedia.org/wiki/Boeing_X-37 https://en.wikipedia.org/wiki/Boeing_X-37