20TH Fighter Wing Public Affairs
U.S. Air Force Senior Airman Jack Gordon, 20th Medical Group bioenvironmental engineer, tests water contamination levels at Shaw Air Force Base, South Carolina, June 18, 2019. Gordon is in charge of testing the water daily for contaminants and bacteria to ensure the power of hydrogen (PH) level is in between seven and nine. (U.S. Air Force photo by Airman 1st Class Kaitlyn Brewer)

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Photo by: Airman 1st Class Kaitlyn Brewer |  VIRIN: 190618-F-YA436-1003.JPG