U.S. Air Force Airman 1st Class Christian Vanderson, 20th Logistics Readiness Squadron petroleum, oil and lubricants operator, drains water out of the tank sump of an R-11 mobile refueling unit at Shaw Air Force Base, S.C., June 3, 2016. Duties of POL operators include vehicle checks, fueling up aircraft and performing lab work to ensure fuel quality. (U.S. Air Force photo by Airman 1st Class Destinee Dougherty)
<br>Unit: 20th Fighter Wing Public Affairs
Airman 1st Class Destinee Sweeney
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