Is the U.S. Navy betting too much on a new generation of nuclear-powered warships? According to Military Watch Magazine, the proposed BBG(X) program envisions a fleet of 15 giant surface combatants with an estimated lifetime cost of nearly $700 billion. Supporters argue the ships are better suited for the era of hypersonic missiles, while critics warn the project could strain shipyards, slow submarine production and compete with destroyer and aircraft carrier programs. Here's why the ambitious plan has sparked a major debate over the future of American naval power.