Col. Patrick McKenzie, 51st Fighter Wing commander, gets an orientation on his new hybrid car here Oct. 21, 2011. As a part of an initiative based on Executive Order 13514, which is federal guidance mandating the reduction of petroleum use and greenhouse gases over the next 20 years in the U.S. government vehicle fleet. Department of Defense officials set a goal of a 34 percent reduction of greenhouse gas emissions by 2020. (U.S. Air Force photo/Staff Sgt. Michael Garza)