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U.S. Air Force Senior Airman Brandon Williams, 786th Civil Engineer Squadron water and fuel systems maintenance journeyman, left, and Tech. Sgt. Ronald Melton, 435th Construction and Training Squadron water and fuel systems maintenance contingency training noncommissioned officer in charge, conduct a water purification test with a reverse osmosis water purification unit during proficiency training at Ramstein Air Base, Germany, April 29, 2020. The 435th CTS teaches a specialty course for all U.S. Air Forces in Europe water and fuel systems maintenance Airmen on how to properly operate and maintain the ROWPU in a contingency environment. (U.S. Air Force photo by Senior Airman Milton Hamilton)
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