sub-orbital fighters/bombers.I've asked once before, I'll ask again: what weapons system would benefit from sub-orbital altitudes? And hyper-sonic speeds? You realize that dropping a bomb at those parameters would involve actually releasing the weapon over the wrong country in certain circumstances?
"I've asked once before, I'll ask again: what weapons system would benefit from sub-orbital altitudes?" 
The aviation arms race has perenially sought to fly higher than the competition, faster than the competition.
Now we've got *civilians* flying higher and faster than military F-22's.
Based upon history, flying higher and faster are military advantages. We dismiss such achievements at our own peril, too.
Our enemies won't.