180607-N-NE794-077 WASHINGTON (June 7, 2018) The Mixed Odor Delivery Device developed by the U.S. Naval Research Laboratory contains four compartments in the base, right,, each with an odor regulating lid that releases odors to mix into the top of the container, left, to be expelled and tested with canine units. (U.S. Navy photo by Gabrielle Gibert/Released)