Not quite high enough
12 miles up is pretty useful, and presumably the idea is that that is out of range of whatever the Taliban/Libyans (or whoever the current enemy-of-the-month is) can put up to shoot them down.
However, did not our own PARIS get up to 17 miles? Could PARIS be modified to carry offensive kit? Have you had any requests for blueprints from suspicious addresses in Afghanistan or down-town Tripoli? Should we hurry up and get LOHAN in orbit before balloons are banned under the US arms export regulations?