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Senior Airman Joseph Fletcher, 71st Expeditionary Air Control Squadron radar maintenance technician and native of Tacoma, Wash., watches the frequency change on an oscilloscope while performing a function check on a TPS-75 radar here March 13, 2012. The TPS-75 is a mobile aerospace control and warning radar that has been in service since 1968. (U.S. Air Force photo/Staff Sgt. Nathanael Callon)
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