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BAGRAM AIR FIELD, Afghanistan -- Staff Sgt. David Bertsch, 494th Expeditionary Aircraft Maintenance Unit crew chief, listens to the engines of an F-15E Strike Eagle on July 21, 2008. Oftentimes listening to the engine will allow crew chiefs to identify problems with the engines that would otherwise be difficult to spot. Sergeant Bertsch is deployed from the 494th Aircraft Maintenance Unit, RAF Lakenheath, England. (U.S. Air Force photo by Staff Sgt. Samuel Morse)
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