Staff Sgt. Joshua Baldwin, 28th Logistics Readiness Squadron refueling maintenance mechanic, removes a gasket from a master meter during scheduled maintenance in the fuels shop at Ellsworth Air Force Base, S.D., Oct. 16, 2012. The master meter calibrates all fuel meters on base to ensure accurate readings and efficient use of resources. (U.S. Air Force photo by Airman 1st Class Kate Thornton-Maurer/Released)