A new stockpile-management program should reduce the number of nuclear warheads needed to sustain a credible deterrent force, the top U.S. general in charge of the country's atomic arsenal said today. That said, the United States will still have nuclear weapons 40 years from now, according to Air Force Gen. Kevin Chilton, chief of U.S. Strategic Command. Since taking office in January, President Obama has said in speeches that the United States is committed reducing the nation's nuclear arsenal in...