Senior Airman Joshua McKelvey, a fuels lab technician, conducts fuels testing for dryness, cleanliness and suitability for use. It is important to keep the fuel free of contaminants including water, which can be deadly because it freezes at high altitudes.

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Size: 2208px × 1474px
Photo credit: © LOU Collection / Alamy / Afripics
License: Licensed
Model Released: No

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