U.S. Air Force Maj. Gen. Scott J. Zobrist, 9th Air Force commander, passes command to Col. Sean Tyler, 633rd Air Base Wing incoming commander, during a change of command ceremony at Joint Base Langley-Eustis, Va., June 22, 2017. Tyler assumed command after serving as the Defense Logistics Agency executive officer to the director, Fort Belvoir, Va. (U.S. Air Force photo by Airman 1st Class Tristan Biese)