Pentagon vows 'demanding but fair' in F-35 talks with Lockheed
March 27, 2015 at 17:35 PM EDT
WASHINGTON, March 27 (Reuters) - The U.S. Defense Department on Friday said it will be "demanding but fair" in negotiations with Lockheed Martin Corp for the next two batches of F-35 fighter jets, one of the Pentagon's largest-ever sole-source contracts.