Peter, a rescue dog turned service dog, performs his final test for certification by resisting a piece of food to be placed in front of him at the Omaha Gun Club, Dec. 10, 2019, Omaha, Neb. Peter has been trained to provide an anxiety reaction, motivation, medication reminders and to sense anxiety for Master Sgt. Tim Williams, with the Office of the Warrior Advocate. (U.S. Air Force photo by Josh Plueger)