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Matt Miller, 9th Maintenance Group T-38 aircraft mechanic, checks the oil in a T-38 Talon engine during a post-flight inspection Dec. 5, 2016, at Beale Air Force Base, California. The mechanics take an oil sample from T-38 engines every 20 flight hours. (U.S. Air Force Photo/Airman Tristan D. Viglianco)
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