Airman Grant Stewart, 92nd Maintenance Squadron aircraft structural maintenance apprentice, measures the corrosion affected area of a KC-135 Stratotanker at Fairchild Air Force Base, Washington, Feb. 7, 2018. The Aircraft Structural Maintenance shop requests over 50 ETARs annually, as they discover more corrosion at the field level that requires repairs. The process being performed is conducted to return the aircraft to full mission-capable status. (U.S. Air Force photo/Senior Airman Sean Campbell)

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Photo by: Senior Airman Sean Campbell |  VIRIN: 180207-F-GP610-071.JPG