KC-135 Stratotanker A U.S. Air Force KC-135 Stratotanker assigned to the Iowa Air National Guard’s 185th Air Refueling Wing in Sioux City, Iowa, takes off from the Sioux City airport for a local flying mission on August 29, 2018. SHARE: Download: Full Size (2.74 MB) Credit: Air Force Senior Master Sgt. Vincent De Groot, Air National Guard VIRIN: 180829-Z-KZ880-018C.JPG Photo Gallery