Staff Sgt. Ed Youmans, 16th Electronic Warfare Squadron, demonstrates a procedure on the USM 642 "Raven" signal generator - a machine that simulates any real world radar emitter and allows the Combat Shield team to assess aircraft responses to those signals. The Combat Shield unit is tasked with testing the air defense systems of almost all A-10s, F-15s, F-16s, HH-60s and HC-130s in the Combat Air Forces. U.S. Air Force photo.
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