Staff Sgt. Norman Thomson, 9th Communication Squadron, Spectrum Operations Frequency Management, explains to Brig. Gen. David Urich, Director of Communications, Headquarters Air Combat Command, the Spectrum Operations on Beale Air Force Base, Calif., March 14, 2012. Spectrum Operations are responsible more than 200 frequencies assigned to the installation. (U.S. Air Force photo by Airman 1st Class Samuel W. Sanders/Released)
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