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Capt. Brian Gatzke, a test engineer with the Propulsion Test Branch of Arnold Engineering Development Complex, speaks with Theron Price, a doctoral student at the University of Tennessee Space Institute (UTSI), about the focused laser differential interferometry set up in front of them at UTSI within the confines of Arnold Air Force Base, Tenn., Dec. 15, 2021. (U.S. Air Force photo by Jill Pickett)
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