size and that components are in compliance with applicable Federal law, Federal regulations, executive branch guidance, and Department policy (including associated guidance) pursuant to paragraph (2) relating to fleet management and use of vehicles from home to work. The Under Secretary shall use such tools and plans when reviewing annual component requests for vehicle fleet funding in accordance with paragraph (6). (5) Guidance to develop fleet management plans The Under Secretary for Management shall provide guidance, pursuant to paragraph (1)(B) on how component heads may achieve optimal fleet size in accordance with paragraph (4), including processes for the following: (A) Leasing or acquiring additional vehicles or replacing existing vehicles, if determined necessary. (B) Disposing of excess vehicles that the Under Secretary determines should not be reallocated under subparagraph (C). (C) Reallocating excess vehicles to other components that may need temporary or long-term use of additional vehicles. (6) Annual review of vehicle fleet funding requests As part of the annual budget process, the Under Secretary for Management shall review and make determinations regarding annual component requests for funding for vehicle fleets. If component heads have not taken steps in furtherance of achieving optimal fleet size in the prior fiscal year pursuant to paragraphs (4) and (5), the Under Secretary shall provide rescission recommendations to the Committee on Appropriations and the Committee on Homeland Security of the House of Representatives and the Committee on Appropriations and the Committee on Homeland Security and Governmental Affairs of the Senate regarding such component vehicle fleets. (7) Accountability for vehicle fleet management (A) Prohibition on certain new vehicle leases and acquisitions The Under Secretary for Management and component heads may not approve in any fiscal year beginning with fiscal year 2019 a vehicle lease, acquisition, or replacement request if such component heads did not comply