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Senior Airman Darnell Ward, 919th Special Operations Civil Engineer Squadron, calibrates the automatic control valve on the fuel line at Eglin Air Force Base, Fla.,July 8, 2017. The fuel line controls the pressure and rate at which fuel is transferred from the storage tanks to vehicles which service aircraft arriving and departing the base. The tests ensure there is no damage to aircraft or refueling vehicles due to tanks being over pressurized. (Air Force photo/Lt. Col. James R. Wilson)
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