U.S. Air Force Senior Airmen Cavin Meneses, front, and Kai Hall, 35th Communications Squadron airfield systems technicians, check the waveform of the instrument landing system signal on an oscilloscope during a system performance check Jan. 20, 2011, Misawa Air Base, Japan. Pilots use data from the ILS to align their approach with the runway for a safe and accurate landing. (U.S. Air Force photo by Tech. Sgt. Phillip Butterfield/Released)
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