Quinn Construction and Complete Contracting Solutions workers prepare to excavate concrete slabs from B-1 parking spots during flighline reconstruction project at Ellsworth Air Force Base, S.D., Aug. 5, 2013. Three rows of aircraft parking spots will be renovated to ensure the integrity of Ellsworth’s aircraft parking area. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)