(Editor's Note: This story has been updated to reflect that the Ground-Based Strategic Deterrent program is risk of being squeezed out of the budget once spending on more established programs like the new bomber, Ohio-class replacement and B61 life-extension ramp up.) 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...