Senior Airman Anthony Phillips, 28th Aircraft Maintenance Squadron, 34 Aircraft Maintenance Unit, instillation flight control technician, uses an accessory drive gearbox to turn the pumps of a B-1 bomber during routine maintenance at Ellsworth Air Force Base, S.D., Jan. 6, 2016. The accessory drive gearbox simulates the B-1 being active as a means to accurately replicate airborne issues. (U.S. Air Force photo by Airman 1st Class Denise M. Nevins/Released)