Airman 1st Class Peyton Oesterreich, 49th Aerospace Medicine Squadron bioenvironmental engineer apprentice, mixes a water sample from the Domenici Fitness and Sports Center pool at Holloman Air Force Base, N.M., June 27. The water in the test tube changes colors when test chemicals react to chemicals in the water sample. Oesterreich tests the base pools to ensure they have safe hydrogen and chlorine levels. (U.S. Air Force photo by Airman Leah Ferrante/Released)
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