Riko, 374th Security Forces Squadron military working dog, lays down to signal to his handler, Staff Sgt. Seth Shannon, 374th SFS MWD handler, the presence of a controlled substance during a demonstration at the Tokyo Customs Canine Training Center at Narita, Japan, Dec. 19, 2019. The 374th SFS MWD and Tokyo Customs drug detection dogs have been helping each other train for three years. (U.S. Air Force photo by Airman 1st Class Brieana E. Bolfing)