U.S. Air Force Airman Jacob Rievel, 100th Logistics Readiness Squadron vehicle maintainer from Johnstown, Pa., checks the engine oil level on a newly assigned low-carbon, fuel-efficient diesel sedan Dec. 6, 2013, on RAF Mildenhall, England. The 100th LRS replaced 19 vehicles with a newer more environmentally friendly fleet. To further reduce the squadron’s carbon footprint, where possible, the use of teleconferencing is being used instead of attending meetings. They are also utilizing computer based training rather than temporary deployments that are out of walking distance, and walking to all other training where possible. (U.S. Air Force photo by Gina Randall/Released)