10 U.S.C. § 2922g: Preference for motor vehicles using electric or hybrid propulsion systems; purchase or lease of certain electric and other vehicles

will meet the requirements or needs of the Department of Defense; and are commercially available at a cost, including operating cost, reasonably comparable to motor vehicles containing only an internal combustion or heat engine using combustible fuel. Subsection (a) does not apply with respect to tactical vehicles designed for use in combat. The preference required by subsection (a) does not preclude the Secretary of Defense from authorizing, during the period specified in subsection (a), the Secretary of a military department or head of a Defense Agency to provide a preference for another vehicle technology that reduces the consumption of fossil fuels if the Secretary of Defense determines that the technology is consistent with the energy performance goals and plan of the Department required by section 2911 of this title . an electric or zero emission vehicle that uses a charging connector type (or other means to transmit electricity to the vehicle) that meets applicable industry accepted standards for interoperability and safety; an advanced-biofuel-powered vehicle; or a hydrogen-powered vehicle. the technology used in the vehicle to be purchased or leased reduces the consumption of fossil fuels compared to vehicles that use conventional internal combustion technology; the purchase or lease of such vehicle is consistent with the energy performance goals and plan of the Department of Defense required by section 2911 of this title ; and the purchase or lease of a vehicle described in subsection (d) is impracticable under the circumstances. The Secretary of Defense may waive the requirement under subsection (d). The Secretary of Defense may not delegate the waiver authority under paragraph (1). The term “advanced-biofuel-powered vehicle” includes a vehicle that uses a fuel described in section 9001(3)(A) of the Farm Security and Rural Investment Act of 2002 ( 7 U.S.C. 8101(3)(A) ). that is not a tactical vehicle designed for use in combat; and that is purchased or leased by the Department of Defense pursuant to a contract entered into, renewed, modified, or amended on or after October 1, 2035 . The term “hydrogen-powered vehicle” means a vehicle that uses hydrogen as the main source of motive power, either through a fuel cell or internal combustion. None of the funds authorized to be appropriated by this Act [see Tables for classification] or otherwise made available for the Department of Defense may be obligated or expended to procure non-tactical vehicles that are electric vehicles, advanced-biofuel-powered vehicles, or hydrogen-powered vehicles, or any components or spare parts associated with such vehicles, that are not in compliance with subpart 22.15 of the Federal Acquisition Regulation (or any successor regulations). The term ‘advanced-biofuel-powered vehicle’ includes a vehicle that uses a fuel described in section 9001(3)(A) of the Farm Security and Rural Investment Act of 2202 [2002] ( 7 U.S.C. 8101(3)(A) ). The term ‘charging station’ means a parking space with electric vehicle supply equipment that supplies electric energy for the recharging of electric vehicles with at least a level two charger. The term ‘electric grid requirements’ means the power grid and infrastructure requirements needed to support plug-in electric vehicles and vehicle-to-grid requirements. The term ‘electric non-tactical vehicle’ means a non-tactical vehicle that is an electric vehicle. a plug-in hybrid electric vehicle that uses a combination of electric and gas powered engine that can use either gasoline or electricity as a fuel source; and a plug-in electric vehicle that runs solely on electricity and does not contain an internal combustion engine or gas tank. The term ‘hydrogen-powered vehicle’ means a vehicle that uses hydrogen as the main source of motive power, either through a fuel cell or internal combustion. The term ‘non-tactical vehicle’ means a vehicle other than a tactical vehicle. The term ‘tactical vehicle’ means a motor vehicle designed to military specification, or a commercial design motor vehicle modified to military specification, to provide direct transportation support of combat or tactical operations, or for the training of personnel for such operations.”