The Navy is required by law to submit a report to the Congress each year that projects the service's shipbuilding requirements, procurement plans, inventories, and costs over the coming 30 years. Since 2006, the Congressional Budget Office (CBO) has been performing an independent analysis of the Navy's latest shipbuilding plan at the request of the Subcommittee on Seapower and Expeditionary Forces of the House Armed Services Committee. This CBO report, the latest in that series, summarizes the ship requirements and purchases described in the Navy's 2011 plan and assesses their implications for the Navy's funding needs and ship inventories through 2040. The new plan appears to increase the required size of the fleet compared with earlier plans, while reducing the number of ships to be purchased, and thus the costs for ship construction, over the next three decades. Despite those reductions, the total costs of carrying out the 2011 plan would be much higher than the funding levels that the Navy has received in recent years.