(Right to left) Airman Mark Vadnais, 28th Aircraft Maintenance Squadron able chief, learns which switches to activate or deactivate before conducting B-1B Lancer maintenance from Staff Sgt. Chris Dieball, 28th AXMS crew chief instructor, at Ellsworth Air Force Base, S.D., Jan. 21. Knowing which buttons and switches to push is crucial when dealing with the multi-million dollar aircraft. (U.S. Air Force photo/Senior Airman Anthony Sanchelli)