Air Force Chief of Staff Gen. David Goldfein told lawmakers today he's seen a measurable improvement in Boeing's KC-46 performance since the company's new CEO Dave Calhoun took charge. "I have seen a significant change in the behavior of that company since he took over," Goldfein said during a Senate Armed Services Committee hearing. "That's why we're more confident that we have a serious fix on the table." Goldfein in January sent Calhoun a letter highlighting the service's concerns about...