(Editor's Note: This story has been updated to include comments by Boeing's chief operating officer.) The chief executives of two of the largest defense contractors said Wednesday they have cut costs and are now seeking growth, particularly through international sales. Phebe Novakovic, CEO of General Dynamics, said at a conference hosted by Sanford C. Bernstein that her company is now in a better position after reducing its cost structure. She particularly pointed to the contractor's combat systems business, where...