U.S. Air Force Senior Airman Randell Rountree, 35th Communication Squadron radio frequency transmissions systems technician, listens for sounds of wear on gears in a satellite antenna gear box Jan. 11, 2011, on Misawa Air Base, Japan. When gears start to wear out, they emit an audible clicking, grinding sound as they slip past other gears in the box. RFTS technicians perform preventative maintenance and inspections on equipment to ensure proper operation. (U.S. Air Force photo/Tech. Sgt. Phillip Butterfield)
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