1. Department of Defense phase-in of zero-emission non-tactical motor vehicles (a) In general To the extent practicable, the Secretary of Defense shall replace any motor vehicle in use at a military installation that reaches the end of its service life with a zero-emission vehicle. (b) Exception Subsection (a) does not apply with respect to tactical vehicles designed for use in combat. (c) Report to Congress Not later than one year after the date of the enactment of this Act, the Secretary of Defense shall submit to the Committees on Armed Services of the Senate and House of Representatives a report on the feasibility of carrying out the requirement under this section. If the Secretary determines that an exception to the requirement is necessary for any military installation, the Secretary shall include in the report a request for the exception together with the reasons why the exception is necessary. 2. Reduction of petroleum fuel consumption (a) In general The Secretary of Defense shall take such steps as may be necessary to decrease the petroleum fuel consumption of Department of Defense Federal fleets, with the goal of a achieving a 50 percent reduction in annual petroleum consumption by October 1, 2030, as compared to the baseline petroleum consumption level during fiscal year 2005. (b) Report If the Secretary determines that the Department is unable to meet the goal under subsection (a), not later than on year after the date of the enactment of this Act, the Secretary shall submit to the Committees on Armed Services Committees of the Senate and House of Representatives a report describing the technical and practical reasons why the Department is unable to meet the goal.