Airmen from the 28th Aircraft Maintenance Squadron participate in a base operational readiness exercise while a B-1 bomber is launched at Ellsworth Air Force Base, S.D., Oct. 20, 2015. The exercise evaluated several units that support the operational mission at Ellsworth, and included aircraft maintenance, simulated damage assessment, and how to respond to a Chemical, Biological, Radiological, Nuclear, and High Yield Explosives reconnaissance threat among other capabilities. (U.S. Air Force photo by Senior Airman Rebecca Imwalle/Released)