Airmen from the 28th Civil Engineer Squadron smooth down base course to prepare for the laying down of cement in front of the Holbrook Library at Ellsworth Air Force Base, S.D., June 16, 2016. As part of a renovations project, the base library will be getting new paved sidewalks in addition to a new patio for its patrons to enjoy during their visits. (U.S. Air Force photo by Senior Airman Anania Tekurio/Released)