While most of the time those of us who write about space get to look at pretty pictures and think happy thoughts about new scientific discoveries, there's not a whole lot that's stopping various government entities from militarizing space, besides the pesky Treaty of Outer Space.
In a hearing before the House Armed Services Committee yesterday, Lt. Gen. Trey Obering said that current terrestrial defense systems "could be greatly enhanced" if only we had a space-based system to shoot down missiles.
But given the sensitive nature of something like this, it's quite possible that there's a bunch of covert money being spent on this, according to an interview by New Scientist with Sam Black of the Center for Defense Information.