Senior Airman Alexander Delfs, 436th Aerospace Medicine Squadron bioenvironmental engineering journeyman, collects a water sample for bacteriologic testing Nov. 16, 2016, at an aircraft watering point on Dover Air Force Base, Del. Members of the 436th AMDS bioenvironmental engineering flight send water samples to a laboratory to test for the presence of harmful bacteria in drinking water.

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Photo credit: © Conner Flecks / Alamy / Afripics
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