U.S. Air Force Col. Al Wimmer, 35th Fighter Wing vice commander, breaks down an F-16 Fighting Falcon F110-100 model engine at Misawa Air Base, Japan, March 27, 2012. Wimmer got first-hand training from Airmen in the 35th Maintenance Squadron propulsion shop on how to break down the engine during his one-day immersion as a ‘knuckle dragger’. Engines go through upgrades every 4,000 flying hours through the service life extension program. (U.S. Air Force photo by Tech. Sgt. Marie Brown/Released)
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