Staff Sgt. Sean Heart, 434th Maintenance Squadron aircraft mechanic, and Senior Airman Joseph Trimmer, 434th MXS aircraft mechanic, tighten screws on the wing of a KC-135R Stratotanker at Grissom Air Reserve Base, Ind., March 5, 2017. The maintenance was part of an isochronal inspection, in which every system on the aircraft is inspected for damage and signs of wear once every two years. (U.S. Air Force photo/Senior Airman Harrison Withrow)
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