I'm with LivinInMem. Having flown combat missions in Iraq and Afganistan, the most difficult piece of the puzzle was ensuring you were putting ordinance on the right spot, especially w/ CAS which has been 99.9999% of the missions since the first few nights of OEF and OIF.
I think we all knew this day was coming when unmanned aircraft would start "fighting" in combat. The future really snuck up on us.