JOINT BASE ANDREWS, Md. -- Staff Sgt. Justin Rush, 316th Security Forces Sqaudron training instructor, shows Airmen from the 459th Security Forces Squadron how to operate the Nasatka barrier at the north gate, here Sept. 11 during the Unit Training Assembly. Nasatka barriers are commonly found at the gates of military installations like Joint Base Andrews and are capable of stopping a 10,000 pound vehicle dead in its tracks. (U.S. Air Force photo/Tech. Sgt. Steve Lewis)