A B-1 bomber is hooked up to the Consolidated Aircraft Support System at Ellsworth Air Force Base, S.D., March 16, 2017. Compared to the 20,000 pound air conditioner previously used for pre-flight, CASS is virtually quite, allowing maintainers to communicate more effectively during pre-flight inspections. (U.S. Air Force photo by Airman 1st Class Donald C. Knechtel)