GRISSOM AIR RESERVE BASE, Ind., -- Rob Hoffman, an air traffic control radar technician, performs periodic maintenance on the identification friend or foe section of Grissom's airport surveillance radar. The system provides air traffic controllers with range, azimuth, and altitude and aircraft identification codes within Grissom's designated airspace in north-central Indiana. (U.S. Air Force photo/Master Sgt. Steve Robertson)
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