Senior Airman Justin Hutchens, 28th Civil Engineer Squadron heating and air conditioning technician, disassembles a gas pipe during a heating system installation at Ellsworth Air Force Base, S.D., Feb. 2, 2012. This 28th CES HVAC shop ensures that all buildings on Ellsworth meet work environment requirements, and provide a suitable work environment for all base personnel. (U.S. Air Force photo by Airman Alystria Maurer/Released)