Senior Airman Alexander Delfs, 436th Aerospace Medicine Squadron bioenvironmental engineering journeyman, runs water for testing Nov. 16, 2016, at an aircraft watering point on Dover Air Force Base, Del. Members of the 436th AMDS biomedical engineering flight are responsible for monitoring air quality, respiratory protection and water quality for the installation.

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Photo credit: © Apple White / Alamy / Afripics
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