Ill-defined and incoherent Pentagon policies governing foreign military sales have hindered exports of U.S. unmanned aircraft to partner nation forces, putting the United States and its allies in danger of losing its edge in a key area, a top industry executive said today. “It is a challenge to navigate through [that] process . . . We are still struggling to sell unmanned aircraft, even to our allies,” Northrop Grumman's President and Chief Executive Officer Wes Bush said during a speech...