91st Air Refueling Squadron welcomes new commander Published June 7, 2020 By Senior Airman Shannon Bowman 6th Air Refueling Wing Public Affairs MACDILL AIR FORCE BASE, Fla. – -- U.S. Air Force Lt. Col. Ivan Blackwell assumed command of the 91st Air Refueling Squadron from Lt. Col. Jesse Caldwell, during a change of command ceremony at MacDill Air Force Base, Florida, June 5, 2020.