Sergeant Steven Goss, dog trainer with the Marine Corps Police Department K-9 unit on Marine Corps Logistics Base Barstow, guides his dog, Hokie, through a contraband detecting training exercise, June 28. The K-9 unit trains their dogs on detection at least twice a month. - Sergeant Steven Goss, dog trainer with the Marine Corps Police Department K-9 unit on Marine Corps Logistics Base Barstow, guides his dog, Hokie, through a contraband detecting training exercise, June 28. The K-9 unit trains their dogs on detection at least twice a month.