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Senior Airman Joseph Fletcher, 71st Expeditionary Air Control Squadron radar maintenance technician and native of Tacoma, Wash., adjusts the frequency on an oscilloscope during a function check on a TPS-75 radar here March 13, 2012. An oscilloscope displays radio frequency wave forms, which can be used to determine the amount of power the radar antenna produces. (U.S. Air Force photo/Staff Sgt. Nathanael Callon)
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