U.S. Army Sgt. Avery Arrington, 221st Military Police Detachment traffic noncommissioned officer in charge, and U.S. Air Force Staff Sgt. Dontarie Russ, 633rd Security Forces Squadron military working dog trainer, set up for explosive detection training at Langley Air Force Base, Va., April 15, 2014. Arrington participated in the Security Forces/Military Police Exchange Program, where one week a month Soldiers and Airmen switch places learn about each other’s job. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)