Staff Sgt. Alan Dickinson, 451st Air Expeditionary Wing Tactical Automated Security System NCO in charge, locks a security system enclosure during a routine inspection Oct. 28, 2011, at Kandahar Airfield, Afghanistan. The security system is designed to detect motion, heat, and vibration on or near the base’s perimeter. (U.S. Air Force photo by Senior Airman David Carbajal)