U.S. Army Sgt. Avery Arrington, 221st Military Police Detachment traffic noncommissioned officer in charge, shadows U.S. Air Force Senior Airman Matthew Fields, 633rd Security Forces Squadron military working dog handler, at Langley Air Force Base, Va., April 15, 2014. Arrington learned what the MWD handler’s job entails as they train for explosive detection training. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)