Airman 1st Class Andrew Burdette, 100th Civil Engineer Squadron Water and Fuels Maintenance journeyman from Victorville, Calif., uses a pipe-threading machine to cut a steel pipe used for water flow March 13, 2013, at RAF Mildenhall, England. The wastewater goes into sloping sewer lines that are gravity fed. The water is fed into a pressurized sewer line and goes to a sewer plant for treatment. (U.S. Air Force photo by Gina Randall/Released)