COATEPEQUE, Guatemala – Army Reserve Spc. Gabriel Sotomayor, 105th Water Purification and Distribution Company distribution technician, pours a packet of non-diethyl-phenylene diamine chlorine reagent into a water sample for testing purposes May 4, 2016 during Exercise BEYOND THE HORIZON 2016 GUATEMALA. To ensure safety for personnel, chlorine levels must be below one part per million before it can be used. ( Air Force photo by Senior Airman Dillon Davis/Released)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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