Working Dog Demo Rex, a military working dog, takes down Air Force Staff Sgt. Brandon Hardy during a demonstration for elementary school students at Eglin Air Force Base, Fla., May 17, 2016. Hardy and Rex are assigned to the 96th Security Forces Squadron. Air Force photo by Samuel King Jr. SHARE IMAGE: Download Image: Full Size (0.81 MB) Photo By: Samuel King VIRIN: 160517-F-OC707-905A.JPG Photo Gallery