Staff Sgt. Darrien Miller, 99th Communications Squadron radar maintenance non-commissioned officer in charge, performs a preventive maintenance inspection on the Airfield Surveillance Radar Nov. 19, 2012, at Nellis Air Force Base, Nev. The ASR-9 combines circular polarization with moving target detection for vastly improved aircraft detection in weather conditions. (U.S. Air Force photo by Airman 1st Class Christopher Tam)
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