Airman 1st Class Jasmine Simon, 2nd Aerospace Medical Squadron bioenvironmental engineer, conducts a wet-bulb test on Barksdale Air Force Base, La., June 11, 2013. Wet-bulb tests are used to establish the heat-stress index, which helps determine safe work/rest cycles. (U.S. Air Force photo/Senior Airman Kristin High)
Staff Sgt. Shawn Gallagher, 2nd Aerospace Medical Squadron bioenvironmental engineer, closes a water pack with sample on Barksdale Air Force Base, La., June 11, 2013. The sample will be dropped off at a state laboratory and tested for bacteriological contamination to ensure compliance with Louisiana's standards for Barksdale's drinking water system. (U.S. Air Force photo/Senior Airman Kristin High)
Staff Sgt. Shawn Gallagher, 2nd Aerospace Medical Squadron bioenvironmental engineer, fills a test tube with a water sample on Barksdale Air Force Base, La., June 11, 2013. The sample will be dropped off at a state laboratory and tested for bacteriological contamination to ensure compliance with Louisiana's standards for Barksdale's drinking water system. (U.S. Air Force photo/Senior Airman Kristin High)
Staff Sgt. Shawn Gallagher, 2nd Aerospace Medical Squadron bioenvironmental engineer, mixes a water sample with a reagent to check chlorine residuals in the water on Barksdale Air Force Base, La., June 11, 2013. The sample will be dropped off at a state laboratory and tested for bacteriological contamination to ensure compliance with Louisiana's standards for Barksdale's drinking water system. (U.S. Air Force photo/Senior Airman Kristin High)