Master Sgt. Matthew Treadwell, 22nd Security Forces Squadron flight leader, discusses the barrier system with Maj. Gen. Sam Barrett, 18th Air Force commander and his wife, Mrs. Kelly Barrett, May 2, 2019, at McConnell Air Force Base, Kan. Gen. Barrett and Mrs. Kelly Barrett visited McConnell to learn more about the base and the challenges the Airmen face. (U.S. Air Force photo by Airman 1st Class Alexi Myrick)