From the Congressional Budget Office September, 2013 Analysis of the U.S. Navy’s Fiscal Year 2014 Shipbuilding Plan:
The 2013 and 2014 shipbuilding plans are very similar, but not identical, with respect to the Navy’s total inventory goal (in military parlance, its requirement) for battle force ships, the number and types of ships the Navy would purchase over 30 years, and the proposed funding to implement the plans.
The Congressional Budget Office (CBO) examined the 2014 plan in detail and estimated the costs of the proposed ship purchases using its own estimating methods and assumptions. CBO also analyzed how those ship purchases would affect the Navy’s inventories of various types of ships over the next three decades.
The total costs of carrying out the 2014 plan—an average of about $21 billion in 2013 dollars per year over the next 30 years—would be one-third higher than the funding amounts that the Navy has received in recent decades but slightly less than the costs of the 2013 plan, CBO estimates.