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U.S. Air Force Senior Airman Charles Cross, 378th Expeditionary Maintenance Squadron non-destructive inspection journeyman, reviews a reference card for an ultrasonic unit within the U.S. Central Command area of responsibility, May 12, 2025. Ultrasonic units, along with a reference standard metal, set the basis for what NDI technicians should inspect when testing for delamination within the paint of the aircraft. (U.S. Air Force photo by Senior Airman Erin Dunkleberger)
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