; specialized equipment and training devices; expansion of public and private plants, including ammunition facilities, authorized by section 2854 of title 10, United States Code, and the land necessary therefor, for the foregoing purposes, and such lands and interests therein, may be acquired, and construction prosecuted thereon prior to approval of title; and procurement and installation of equipment, appliances, and machine tools in public and private plants; reserve plant and Government and contractor-owned equipment layaway; and other expenses necessary for the foregoing purposes, $973,556,000, to remain available for obligation until September 30, 2021. Shipbuilding and conversion, navy For expenses necessary for the construction, acquisition, or conversion of vessels as authorized by law, including armor and armament thereof, plant equipment, appliances, and machine tools and installation thereof in public and private plants; reserve plant and Government and contractor-owned equipment layaway; procurement of critical, long lead time components and designs for vessels to be constructed or converted in the future; and expansion of public and private plants, including land necessary therefor, and such lands and interests therein, may be acquired, and construction prosecuted thereon prior to approval of title, as follows: Columbia Class Submarine (AP), $2,949,400,000; Carrier Replacement Program, $1,598,181,000; Virginia Class Submarine, $4,340,676,000; Virginia Class Submarine (AP), $2,796,401,000; CVN Refueling Overhauls (AP), $425,873,000; DDG–1000 Program, $270,965,000; DDG–51 Destroyer, $5,187,837,000; DDG–51 Destroyer (AP), $391,928,000; Littoral Combat Ship, $1,558,505,000; Expeditionary Sea Base, $647,000,000; TAO Fleet Oiler, $977,104,000; TAO Fleet Oiler (AP), $75,046,000; Towing, Salvage, and Rescue Ship, $80,517,000; LCU 1700, $41,520,000; Ship to Shore Connector, $507,875,000; Service Craft, $72,062,000; LCAC SLEP, $23,321,000