Dangerous Darla Darla, a German shepherd assigned to the Army's 549th Military Working Dog Detachment, conducts aggression training at Joint Base Elmendorf-Richardson, Alaska, March 21, 2017. Air Force photo by Justin Connaher SHARE IMAGE: Download Image: Full Size (1.05 MB) Tags: Army, training, Featured Photos Photo By: Justin Connaher VIRIN: 170321-F-LX370-1540D.JPG Photo Gallery