U.S. Air Force Maj. Allison Bradford, Expeditionary Medical Group preventative and aerospace medicine flight commander, takes a sample of ice cubes to test for acceptable ranges in pH, chlorine, and bacteriological presence at an undisclosed location in Southwest Asia, May 11, 2022. Members from the bioenvironmental engineering and public health teams work together in a deployed location to form the Preventive and Aerospace Medicine team. (U.S. Air Force photo by Master Sgt. Christopher Parr)
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