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A technician connects instrumentation to the General Electric F404 engine installed in the Arnold Engineering Development Complex Sea Level Test Cell 1 for testing in support of the Engine Life Extension and Health Monitoring program on June 15, 2021, at Arnold Air Force Base, Tenn. The sensor validation project in SL-1 is funded by the Air Force Research Laboratory Aerospace Systems Directorate. (U.S. Air Force photo by Jill Pickett)
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