Sgt. Rynne W. Brandt, the Provost Marshal?s Office assistant kennel master and a military working dog handler, instructs his dog, Jack, to inspect a windowsill for explosives during a certification exercise at an empty building here July 29. Maj. Wesley T. Prater, Combat Center provost marshal, certified four dogs after they successfully detected nine hidden explosive substances inside the building and in a nearby car. - Sgt. Rynne W. Brandt, the Provost Marshal?s Office assistant kennel master and a military working dog handler, instructs his dog, Jack, to inspect a windowsill for explosives during a certification exercise at an empty building here July 29. Maj. Wesley T. Prater, Combat Center provost marshal, certified four dogs after they successfully detected nine hidden explosive substances inside the building and in a nearby car.