Airman 1st Class William Maldonado Cruz, 364th Training Squadron petroleum, oil and lubricants (POL) student, is a native of Rio Grande, Puerto Rico, and represents Airmen in the POL training course at Sheppard Air Force Base, Texas, Sept. 19, 2017. POL students learn how to fuel aircraft, vehicles and equipment with no contaminants to ensure the Air Force keeps flying. ( Air Force photo by Staff Sgt. Kyle E. Gese)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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