An article in 'AirSpacemag' from the Smithsonian Foundation and the full title and sub-title is:
The Drone that Stalked Bin Laden; The RQ-170 provided a secret, and vital, piece of the intel puzzle.
Link:http://www.airspacemag.com/military-...tLdyYUeKPkd.99

It is quite interesting and almost nothing is written about Bin Laden!