Lot's of cool stuff with or for military apps. goes by my desk in electronics engineering mags and mags like "Machine Design", Design News, etc., every month. (Heck, I'm just an audio electronics engineer!) The REALLY cutting edge stuff is probably too classified to make these mags, but even so, it's pretty clear that on a tech basis, we can't lose, so long as we stay on course...
What the US needs to do is have one of their nuclear submarines surface off the North Korean coast and then submerge. That would send a nice signal to this wackO.