Staff Sgt. Christopher Pettis, 11th Security Forces Squadron military working dog handler, awaits a K-9 demonstration during a base tour for Baltimore Polytechnic Institute High School Air Force Junior Reserve Officer Training Corps at Joint Base Andrews, Md., Feb. 16, 2017. The tour was an opportunity for the base to promote a closer relationship with the local community. (U.S. Air Force photo by Senior Airman Delano Scott)