(Editor's note: This story was updated shortly after publication to include information on comments made earlier this year by Defense Secretary Robert Gates.) Pentagon officials and their Pakistani counterparts are working a new slate of requirements to identify which unmanned aerial system being used by U.S. forces in Afghanistan will be sold to the Pakistani military. Tactical-level drones -- particularly the Army's Shadow unmanned aerial system -- were among one the many capabilities Pakistani Army Chief of Staff Ashfaq Parvez...
