Randy Jack, chief of police, Marine Corps Police Department, right, presents Cpl. Christopher Gurr, Civilian Police Working Dog handler, MCPD, with a certificate for BarrosÕ distinguished service, Tuesday. Barros, a patrol/drug detector dog, retired after seven years during a ceremony at Corporal Dustin Jerome Lee Kennel and Gurr adopted him. - Randy Jack, chief of police, Marine Corps Police Department, right, presents Cpl. Christopher Gurr, Civilian Police Working Dog handler, MCPD, with a certificate for BarrosÕ distinguished service, Tuesday. Barros, a patrol/drug detector dog, retired after seven years during a ceremony at Corporal Dustin Jerome Lee Kennel and Gurr adopted him.