Northrop Grumman announced yesterday that it has completed the sale of its commercial aerostructures sector to the private investment firm The Carlyle Group, a $1.2 billion transaction that is a key element in the company's effort to expand its defense-related business. The Los Angeles, CA-based defense contractor first announced the move in early June. "We continue to redefine Northrop Grumman for the future and are pursuing a strategic model that focuses on our high-growth business areas of defense electronics, information...