Huntington Ingalls Industries believes it will cost 12.5 percent less to close operations at the Avondale shipyard than originally thought, and the company plans to submit a revised proposal to the Navy later this month, company officials said in a second-quarter 2011 earnings teleconference call today. HII, which was spun off from Northrop Grumman last year as an independent shipbuilding company, plans to shutter the Louisiana shipyard by 2013. Barb Niland, corporate vice president for business management and chief financial...