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U.S. Marine Corps photo by Air Force Senior Airman Christopher Ruano/Released 101022-F-3831R-057.JPG
Oct 27, 2010
Master Sgt. Mark Hannah, audio engineer in The U.S. Air Force Band, scans for open frequencies during a performance Oct. 22 at Northwestern High School, Baltimore, Md. The audio engineer designs and adjusts the audio product using electronics, before amplifying the final product for the audience. (U.S. Air Force photo by Air Force Senior Airman Christopher Ruano)
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