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U.S. Staff Sgt. Tina Tram, 378th Expeditionary Medical Squadron bioenvironmental engineer technician, pours a packet of N, N-diethyl-p-phenylenediamine into a test container to examine the levels of free chlorine in the water of an indoor swimming pool within the U.S. Central Command area of responsibility, June 3, 2025. 378th EMDS BEE technicians perform routine water testing to ensure the host nation pool remains safe for U.S. and Royal Saudi Air Force service members to exercise and further develop physical fitness. (U.S. Air Force photo by Senior Airman Erin Dunkleberger)
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