Staff Sgt. Mary Vitte, 36th Maintenance Squadron non-destructive inspection specialist, calibrates an eddy current machine, Feb. 3, 2016, at Andersen Air Force Base, Guam. If there are any defects it will cause a change in the magnetic field which is indicated by a spike or change in signal on the display screen. (U.S. Air Force photo/Airman 1st Class Arielle Vasquez)
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