Airman Croft Bauer, 366th Training Squadron water and fuels systems maintenance course student, uses a pocket colorimeter to perform a chlorine test at Sheppard Air Force Base, Texas, Aug. 23, 2019. The ability to properly conduct a chlorine test is crucial for a WFSM apprentice so they can ensure safe chlorine levels in base swimming pools. Bauer, an Ohio native, is scheduled to graduate the course Oct. 17, 2019. (U.S. Air Force photo by Airman 1st Class Madeleine E. Jinks)