According to the U.S. defense news website, the U.S. Department of defense has proposed to increase the number of naval vessels to about 500, and plans to adjust the composition of the existing fleet. But behind the ambitious plan, there are a series of problems for the US military. In January this year, U.S. Defense Secretary esper proposed to work with external agencies to study the future fleet composition of the U.S. Navy. To this end, the U.S. Department of defense has set up the “future naval force research” project, which is managed by Deputy Secretary of defense David Norquist. There are four groups under the program, namely, the DOD cost and program evaluation office group, the Joint Chiefs of staff group, the Navy group and the conservative Chiku Hudson Institute Group. The four groups jointly study the future U.S. Navy fleet through deduction The ideal mode of composition. < p > < p > < p > < p > “future naval force research” project will evaluate various options for the future strength construction of the U.S. Navy, and affect the U.S. Navy’s ship building plan in the next 30 years. Novel coronavirus pneumonia is being delayed and is expected to be completed later this year, a US Navy spokesman said. < p > < p > at present, the US media have reported the research documents of the U.S. Department of defense cost and program evaluation office team and the Hudson Institute Group. According to the report, the two groups believe that the composition of the US Navy’s future fleet should be more light and flexible, and have more ships. To achieve this goal, the number of aircraft carriers and large surface combat vessels will be reduced, and more small surface combat vessels, unmanned ships, submarines and logistics support vessels will be developed. The number of US Navy ships in the future should be maintained at 480 to 534, an increase of 35% to 50% compared with the current 355. It is composed of manned and unmanned ships, and is expected to be completed in 2030. The U.S. Defense Department’s cost and program evaluation office team and the Hudson Institute Group believe that in the future, the U.S. Navy should increase the number and types of ships, and at the same time, increase the vertical launch system of ship missiles, control the use and maintenance costs of ships, and avoid increasing the number of warships. On this premise, the two groups put forward a series of specific ideas on the composition of the U.S. Navy’s future fleet. For aircraft carriers, the two groups believe that the existing 11 aircraft carriers should be reduced to nine, of which eight are on mission and one is for medium-term maintenance and nuclear fuel replacement. In terms of large surface combat vessels, the U.S. defense department cost and program evaluation office team proposed that the number should be maintained at 80-90, which is at the same level as the current 89 ships. The Hudson Institute team proposed that the number of large surface combat vessels should be slowly reduced and more funds should be invested in the next generation frigate project. < / P > < p > both groups emphasize the position of unmanned warships in the future U.S. Navy Fleet, and believe that 65 to 87 large unmanned ships or frigates with unmanned operation function should be built, and a large number of missile vertical launching systems should be equipped, so as to improve the combat capability decline caused by the decommissioning of equipment such as Allie Burke destroyers. For light ships, the U.S. Defense Department’s cost and program evaluation office team believes that the maximum number of light ships should be 70. The Hudson Institute team believes that the maximum number is 56. In terms of submarines, the two groups both emphasize unmanned and think that on the basis of the current 66 attack submarines, the scale should be slowly expanded, and the number of large-scale unmanned submarines should reach 40-60. For amphibious ships, the U.S. Defense Department’s cost and program evaluation office team recommends maintaining the current size of 10 amphibious assault ships. The Hudson Institute team proposed to reduce the number to five and use the savings to build four light aircraft carriers. For the light amphibious vessels currently conceived by the U.S. Marine Corps, the two teams recommend that the number be limited to 20 to 26. < / P > < p > in addition, the two teams also support the increase in the number of light logistics support vessels, so that the logistics support fleet can deploy 19 to 30 “future light support ships” at any time in the future. Fleet tankers will increase from 17 at present to 21 to 31. For command and support vessels, such as dry cargo carriers, fast expeditionary transport vessels, expeditionary transport terminals and expeditionary sea bases, the Hudson Research Group believes that the number of command and support vessels should be increased from the current 33 to 52. In general, the number of traditional warships such as aircraft carriers, cruisers and destroyers will remain between 316 and 358 in the assumption of the future fleet composition of the US Navy. The number of new light ships and unmanned ships will be the key to the number of U.S. Navy ships reaching about 500. The U.S. Navy’s plan to increase the number of ships to about 500 is huge and ambitious. Esper claims that the Navy needs to increase its ship building budget to meet the needs of fleet transformation. At present, no one knows how to get the funds needed, and esper has not made it clear. The U.S. Department of defense has previously planned to seek a budget of 207 billion US dollars for the 355 naval vessels in the 2021 fiscal year. If the budget is increased to about 500 ships, the plan will undoubtedly need more funds. Even if the budget is only increased by 2%, it will be a huge sum of money for the US Navy. In fact, the U.S. Navy has no money left for the program, and a large amount of budget has been occupied by the Columbia class strategic nuclear submarine under construction. According to US Navy experts, whether the budget for expanding the fleet size should be borne by the Navy budget or by the Department of defense is a major problem facing the plan. After all, the U.S. Navy needs to set aside enough money for training and maintenance in addition to the ship building budget. It can be seen that the US Defense Department and the U.S. Navy will continue to bicker and buck each other over the construction budget of light warships and unmanned warships in the future, which may even lead to “miscarriage” of plans. According to the current state of the US Navy, it is very difficult to realize the plan of about 500 ships. In March 2015, the US Navy announced that it would take 18 months to increase the number of ships to 308. As of September 10, this year, the number of US naval vessels was 296. Both in time and quantity, they are behind the plan. In addition, in recent years, the U.S. Navy has encountered frequent accidents such as ship collision and fire, and the overall situation is not good. The plan of about 500 ships involves a large number of newly built ships, and the related training and maintenance work is complicated, which may be difficult for the US Navy to bear at present. < / P > < p > more importantly, with the hollowing out of the US manufacturing industry, it is also uncertain whether the shipbuilding industry can “digest” the orders brought about by the program. At present, the loss of a large number of professionals in the U.S. shipbuilding industry has led to the rising cost of R & D and manufacturing, and frequent quality problems in design and manufacturing. In the project of FFG frigate, which does not have outstanding performance requirements of the US Navy, none of the schemes proposed by American enterprises won the bid. Instead, the contract was awarded by the Italian company fincantini. The only thing the U.S. government can do is ask the company to build the frigate in the US shipyards it has acquired to save some jobs.