U. S. Marine Corps Cpl. Zachary Devaney, a military working dog handler with the Provost Marshal’s Office, Security and Emergency Services Battalion, directs military working dog, Don, through the obedience course 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, directs military working dog, Don, through the obedience course 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.