There's some interesting allegations that the CIA used the American mercenary company Blackwater to plot the assassination of a Syrian-Greman businessman based in Hamburg. It remains to be seen whether that is true or not. But if it is, it certainly extends the kind of operations that the Private Military Contractors are getting involved with.
I've been exploring both themes in the Death Force series. In 'Fire Force', which is out next month, the unit get hired for an assassination. In 'Shadow Force', which I'm writing right now, they get hired for a black op by British intelligence.
Now, it seems its all coming true.