S-V-80-A combat survival students gather water from a stream June 13, 2015, in the Colville National Forest, Wash. To prevent water-borne illness from occurring, the students learned to add iodine tablets or bleach to purify the gathered water. The students also learned that leaving a bottle of water in the sun will result in water purification by the sun’s ultraviolet rays. (U.S. Air Force photo/Airman 1st Class Nicolo J. Daniello)
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