Staff Sgt. Ryan Garrison embraces his service dog Luke at their home in Glen Burnie, Md., March 29, 2016. Garrison, who worked at the Defense Courier Station-Baltimore at Fort Meade, Md., before he medically retired, was given the Labrador to help him cope with the physical and emotional effects of his combat-related injury. (U.S. Air Force photo/Sean Kimmons)