Airman 1st Class Bryan Dock, 28th Maintenance Squadron electro-environmental systems technician, adjusts the metering on a Christie battery charger while charging a B-1B battery at Ellsworth Air Force Base, S.D., Feb. 9, 2012. The battery is specific to the B-1B, and must be drained and recharged after each flight to ensure it is ready for aircraft operations. (U.S. Air Force photo by Airman Alystria Maurer/Released)