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Senior Airman Christopher Guhl performs audio filter calibration on a 8902A measuring receiver at the 379th Expeditionary Maintenance Squadron Precision Measurement Equipment Laboratory, Al Udeid Air Base, Qatar, Feb. 25, 2014. Testing and validation of test equipment is vital for ensuring a units ability to test their own communications equipment. Guhl is a 379th EMXS PMEL technician deployed from Edwards Air Force Base, Calif., and a Three Rivers, Mich., native. (U.S. Air Force photo by Master Sgt. David Miller)
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