Airman 1st Class Jordan Carroll, 28th Aircraft Maintenance Squadron instrument flight controls system technician, inspects an airspeed indicator in the cockpit of a B-1 during scheduled maintenance on Ellsworth Air Force Base, S.D., Jan. 9, 2012. The indicator enables aircrews to track aircraft speeds and better control the flight of their aircraft. (U.S. Air Force photo by Airman 1st Class Kate Thornton-Maurer/Released)