Staff Sgt. Jose Reyes, 22nd Communications Squadron airfield systems technician, uses an oscilloscope to measure the electrical signal produced by McConnell’s Tactical Air Navigation system March 10, 2010, at McConnell Air Force Base, Kan. Airmen from the 22nd CS perform preventative maintenance on the $250,000 system periodically to maintain its integrity. The TACAN is a system used by all military to help guide aircrew to a military airfield. (U.S. Air Force photo/Airman 1st Class Andrea Salazar)
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