Airmen 1st Class Jeremy Mitchell, left, and Cassandra Nielson, center, and Senior Airman Thomas Goss, right, 28th Civil Engineer Squadron pavements and construction heavy equipment operators, tighten bushings to fasten a fiber glass mat to a splice at Ellsworth Air Force Base, S.D., Sept. 30, 2015. The fiberglass mat is used to cover any craters on an airfield and provides a clean and flat surface for aircraft to take off from without worry of foreign objects being sucked into the engines. (U.S. Air Force photo by Airman Sadie Colbert/Released)