A crew chief from the Iowa Air National Guard signals a full stop of a U.S. Air Force KC-135 flight while on the ramp at the Iowa Air National Guard’s 185th Air Refueling Wing in Sioux City on October 3, 2019. U.S. Air National Guard photo by Senior Master Sgt. Vincent De Groot

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Photo by: Senior Master Sgt. Vincent De Groot |  VIRIN: 191003-Z-KZ880-079.JPG