The largest producer of multibillion-dollar U.S. warships is not moving fast enough to fix its management deficiencies, according to the office of the Navy's acquisition executive. Huntington Ingalls Industries' shipyards stumbled last year in Defense Department reviews concerning earned value management, the Pentagon's top tool for ensuring industry delivers weapons on time and on budget. Since then, the shipbuilder has not made enough progress addressing the problems, said Capt. Cate Mueller, spokeswoman for Navy procurement chief Sean Stackley. "The Navy...