The departure of the head of Boeing's defense, space and security subdivision, which posted heavy losses in the most recent quarter, is the first major change of top

Boeing's new CEO Kelly Ortberg said the company's defense unit chief Ted Colbert is leaving Boeing and that a replacement would be named later. The defense unit accounted for about 40% of Boeing's revenue in the first half of the year.

Boeing said on Friday the head of the company's troubleddefense, space and security unit is leaving the planemaker effective immediately. New Boeing CEO Kelly Ortberg in his first significant move since taking over in August,