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Senior Airman Christopher applies penetrant to a speed brake on an F-15E to look for cracks or damage at an undisclosed location in Southwest Asia September 15, 2015. The penetrant produces a fluorescent color when cast under a black light allowing minute cracks to become visible. Christopher is a nondestructive inspection journeyman assigned to the 380th Expeditionary Maintenance Squadron. (U.S. Air Force photo/Tech. Sgt. Christopher Boitz)
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