(Left) Jonathan Hatton, Newport News Police Department K-9 handler, encourages Halo, NNPD working dog, as he restrains Scott Clark, Florida-based K-9 training agency head trainer, during bite training at Joint Base Langley-Eustis, Va., July 25, 2017. The trainers hid bite guards under different colored shirts to keep the dogs from associating biting a perpetrator with training equipment. (U.S. Air Force photo/Airman 1st Class Kaylee Dubois)