Staff Sgt. Brian Williams tosses a ball to military working dog Carly in the courtyard at Walter Reed National Military Medical Center. Williams asked his visitors if any of them brought toys for Carly to play with. Since they hadn’t, Williams solved the toy trouble by removing the tennis ball from his walker and tossing it in the air to Carly who “jumped” at the chance to play fetch with his handler. (U.S. Air Force photos/2nd Lt. Alexis McGee)