Senior Airman Alexander Delfs, 436th Aerospace Medicine Squadron bioenvironmental engineering journeyman, adjusts water flow for a water test Nov. 16, 2016, at an aircraft watering point on Dover Air Force Base, Del. In addition to conducting water tests at aircraft watering points, members of this unit also test the water at the installation’s youth-age programs facilities.

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Photo credit: © Conner Flecks / Alamy / Afripics
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