U.S. Air Force Senior Airmen Kai Hall, left, and Cavin Meneses, 35th Communications Squadron airfield systems technicians, use a portable instrument landing system to verify that the system is transmitting the correct location for the center of the runway Jan. 20, 2011, Misawa Air Base, Japan. If the ILS malfunctions, aircraft could be directed to land off the runway, damaging the aircraft. (U.S. Air Force photo by Tech. Sgt. Phillip Butterfield/Released)
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