Ted Colbert, the chief executive of Boeing's Defense, Space and Security unit, left the company today as the business struggles to bring its margins back to profitability. “I want to thank Ted for his 15 years of service at The Boeing Co., supporting our customers, our people and our communities,” Boeing CEO Kelly Ortberg wrote in a memo to employees. “At this critical juncture, our priority is to restore the trust of our customers and meet the high standards they...