Ronald Roman, 97th Maintenance Directorate hydraulics mechanic, works on a U.S. Air Force KC-135 Stratotanker selector valve, Nov. 11, 2016, Altus Air Force Base, Oklahoma. The valve is used to direct hydraulic fluid under pressure to raise or lower landing gear for takeoff and landing. (U.S. Air Force Photo by Airman Jackson N. Haddon/Released).
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