WASHINGTON — Ted Colbert, chief executive of Boeing’s defense unit, exited the company today effective immediately amid the unit’s continued poor performance and crippling financial losses. Steve Parker, Boeing defense’s chief operating officer, will take on leadership at the unit while the company seeks out a permanent replacement, Boeing CEO Kelly Ortberg said in a memo to employees. “I want to thank Ted for his 15 years of service at The Boeing Company, supporting our customers, our people and our communities,” Ortberg said in the memo. “At this critical juncture, our priority is to restore the trust of our customers...