Airman Joseph Tower and Airman 1st Class Cody Oleson-Massa, 28th Maintenance Squadron egress technicians, inspect an Advanced Concept Ejection Seat (ACES II) from a B-1 at Ellsworth Air Force Base, S.D., Dec. 13, 2017. The ACES II is a system designed to save an aircrew at a moment’s notice and is the last hope an aircrew has when it comes to surviving an unexpected failure. (U.S. Air Force photo by Airman 1st Class Donald C. Knechtel)