Airman 1st Class Robert Oviedo, 92nd Maintenance Squadron non-destructive inspection apprentice, calibrates ultrasonic equipment before determining the depth of a corroded area on a KC-135 Stratotanker at Fairchild Air Force Base, Washington, Feb. 7, 2018. Recently, the sheet metal shop had to repair a KC-135 that was heavily affected by corrosion. This repair had to be discussed with engineers at Tinker Air Force Base, Oklahoma, because the work required exceeds field-level repair capabilities. (U.S. Air Force photo/Senior Airman Sean Campbell)

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Photo by: Senior Airman Sean Campbell |  VIRIN: 180207-F-GP610-007.JPG