Staff Sgt. Derik Ring, 11th Security Forces Squadron military working dog handler, participates in a K-9 demonstration for Baltimore Polytechnic Institute High School Air Force Junior Reserve Officer Training Corps cadets during a base tour at Joint Base Andrews, Md., Feb. 16, 2017. The tour allowed cadets the chance to observe Air Force operations and experience Air Force life. (U.S. Air Force photo by Senior Airman Delano Scott)