U.S. Air Force Staff Sgt. Kenneth Holt, 27th Special Operations Security Forces Squadron military working dog handler, practices suspect take-down bite drills with K-9 unit Ben K326 at an obstacle course for MWDs at Cannon Air Force Base, N.M., March 15, 2012. All K-9 units assigned to Cannon are dual purpose patrol and detections canines responsible for protecting base personnel and resources.