A letter report issued by the Government Accountability Office with an abstract that begins "The Navy plans to spend about $28 billion to buy 55 Littoral Combat Ships (LCS) and at least 64 interchangeable mission packages to perform one of three missions--mine countermeasures, antisubmarine warfare, and surface warfare--in waters close to shore. The Navy has been developing two different LCS seaframes and plans to select one for production in 2010. Due to the small 78-person crew size--40 core crew, 23 for aviation detachment, and typically 15 for mission packages--the Navy is developing new concepts for personnel, training, and maintenance. GAO was asked to assess the extent to which the Department of Defense (DOD) has (1) estimated LCS long-term operating and support costs and (2) developed plans to operate and support LCS. To do so, GAO compared Navy cost estimates to DOD guidance and GAO best practices; and analyzed Navy plans to implement its concepts for personnel, training, and maintenance and the extent these plans included assessments of program risk."