Cables and plugs
Airman 1st Class Sam Ritzman, 2nd Maintenance Squadron Avionics, plugs cords into a Radio Frequency Interface Unit on a B-52H Stratofortress on Barksdale Air Force Base, La., April 9, 2013. The RFI-U simulates radio frequencies which the B-52s electronic countermeasures pick up and jam or disrupt accordingly. The signals jammed by the ECMs let avionics Airmen know whether the system is functioning properly. (U.S. Air Force photo/Airman 1st Class Andrew Moua)
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