U. S. Marine Corps Cpl. Zachary Devaney, a military working dog handler with the Provost Marshal’s Office, Security and Emergency Services Battalion, pets military working dog, Don, at Marine Corps Base Camp Pendleton, California, Dec. 17, 2019 Handlers and their K9, spend over 50 hours training and developing their bond every week. - U. S. Marine Corps Cpl. Zachary Devaney, a military working dog handler with the Provost Marshal’s Office, Security and Emergency Services Battalion, pets military working dog, Don, at Marine Corps Base Camp Pendleton, California, Dec. 17, 2019 Handlers and their K9, spend over 50 hours training and developing their bond every week.