Visitors line up see a U.S. Air Force KC-10 Extender on display during an open house event at the Iowa Air National Guard base in Sioux City, Iowa on June 10, 2017. The aircraft is assigned to the 60th and the 349th Air Mobility Wings, Travis Air Force Base, Calf. U.S. Air National Guard photo by Master Sgt. Vincent De Groot 185th ARW Wing PA