The Congressional Budget Office has estimated the cost to maintain and upgrade the nation's nuclear enterprise is $348 billion through 2024 as the Pentagon and Energy Department pursue new programs to recapitalize the strategic submarine, intercontinental ballistic missile and bomber forces. The budget office's latest estimate, down $7 billion over last year's prediction due to program adjustments, comes as the Air Force searches for money to fund key bomber, ICBM and cruise missile projects and the Navy continues the Ohio-class...