Air Force Airman 1st Class Jackson Gordon, 20th Aerospace Medicine Squadron bioenvironmental apprentice, places a vial of water into a pocket colorimeter, which measures chlorine, at Shaw Air Force Base, , Jan. 12, 2018. Gordon oversees the water program for the base, monitoring various places on the installation for chemicals and bacteria.

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Photo credit: © Nelly George / Alamy / Afripics
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Keywords: archive, armed, bee, bioenvironmental, defence, engineering, environment, forces, group, health, medical, military, reportage, safety, science, servicemen, usa