Staff Sgt. Evan Spitzer, 28th Civil Engineer Squadron electrical systems craftsman, installs a centerline light after repairing it on a taxiway on Ellsworth Air Force Base, S.D., Feb. 16, 2012. These lights to ensure aircrew can easily see and properly navigate the flightline. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)