WRIGHT-PATTERSON AIR FORCE BASE, Ohio (Dec. 7, 2018) Naval Medical Research Unit Dayton (NAMRU-Dayton) researchers, Mr. Joe Brune and Mr. Mason Liu, prepare the noise generation system for a demonstration at NAMRU-Dayton's Environmental Health Effects Laboratory (EHEL), Nov. 13 2019. EHEL is equipped with a continuous and impulse noise generation system. (U.S. Navy photo by Megan Mudersbach)