Sgt. Daniel Andrzejewski, K9 training chief, Provost Marshal's Office, explains the area where Gabi, military working dog, will search during a class on checkpoint searches with military working dogs for the Engineer Company of Marine Wing Support Squadron 374 at Camp Wilson, July 25, 2014. - Sgt. Daniel Andrzejewski, K9 training chief, Provost Marshal's Office, explains the area where Gabi, military working dog, will search during a class on checkpoint searches with military working dogs for the Engineer Company of Marine Wing Support Squadron 374 at Camp Wilson, July 25, 2014.