Tech Sgt. Chris Fergen, a hydraulic mechanic at the 185th Air Refueling Wing in Sioux City, Iowa, installs an azmimuth pantographic drum assembly onto the air refueling sytstem of a 185th KC-135. Tech. Sgt. Fergen has been working on KC-135 hydraulics for the past ten years. U.S. Air National Guard Photo by Tech. Sgt. Oscar Sanchez/Released.