Senior Airman Mandez Cardwell, 28th Aircraft Maintenance Squadron electro-environmental technician, installs a bleed duct into a B-1 during an Operational Readiness Exercise at Ellsworth Air Force Base, S.D., March 20, 2013. Cardwell was accomplishing work required for a required 1,800 day maintenance inspection. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)