Sgt. Charles Sicklesteel, a military working dog handler with the Provost Marshal’s Office Kennel, releases Ralf, a military working dog with the kennel, during aggression training aboard Marine Corps Air Station Miramar, Calif., Dec. 1. Handlers team up to help train the dogs, which can sometimes mean wearing a protective jacket and being bitten repeatedly. - Sgt. Charles Sicklesteel, a military working dog handler with the Provost Marshal’s Office Kennel, releases Ralf, a military working dog with the kennel, during aggression training aboard Marine Corps Air Station Miramar, Calif., Dec. 1. Handlers team up to help train the dogs, which can sometimes mean wearing a protective jacket and being bitten repeatedly.