Airman 1st Class Andrew Burdette, 100th Civil Engineer Squadron Water and Fuels Maintenance journeyman from Victorville, Calif., takes a sample of the base water supply to ensure chlorine levels are correct Feb. 28, 2013, at RAF Mildenhall, England. Safe chlorine levels ensure clean water, also known as potable water, is safe to drink. The shop is responsible for the cleansing and distribution of all potable water on base. (U.S. Air Force photo by Gina Randall/Released)