Prep work
Airman 1st Class Robert Oviedo, 92nd Maintenance Squadron non-destructive inspection apprentice, calibrates ultrasonic equipment before determining the depth of the corrosion a Fairchild Air Force Base, Washington, Feb. 7, 2018. Before the corrosion could be repaired, an Engineering Technical Assistance Request and a repair plan had to be submitted to engineers at Tinker Air Force Base, Oklahoma, for approval. (U.S. Air Force photo/Senior Airman Sean Campbell)

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Photo by: Senior Airman Sean Campbell |  VIRIN: 180207-F-GP610-029.JPG