Air Force Airman 1st Class Alex McClendon, 633rd Aerospace Medicine Squadron bioenvironmental engineer technician, performs a water quality check at Langley Air Force, Va., Jan. 9, 2015. The 633rd AMDS Bioenvironmental Office performs daily checks on water samples from base to ensure safe for use. Airman 1st Class Areca T. Wilson

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Photo credit: © PJF Military Collection / Alamy / Afripics
License: Licensed
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