Some of the largest defense contractors, reporting earnings Wednesday, said their companies have increasingly focused on cost-cutting to meet the government's needs. Wes Bush, the chief executive of Northrop Grumman, said during a call with analysts that affordability is a “core part” of the company's strategy. “For us, it has been just a drumbeat for some time,” he said. “Our customers are facing such intensity around the budget, we simply have to be more affordable.” Northrop Grumman reported sales in...