Pfc. Lawrence J. Simpson, a combat engineer with Combat Logistics Battalion 31, 31st Marine Expeditionary Unit, pressure-washes the undercarriage of a Humvee, June 1. Simpson was pressure-washing in preparation for Australian Quarantine Inspections, a mandatory inspection of all vehicles and equipment that must be passed before they can enter Australia in support of Exercise Talisman Sabre. - Pfc. Lawrence J. Simpson, a combat engineer with Combat Logistics Battalion 31, 31st Marine Expeditionary Unit, pressure-washes the undercarriage of a Humvee, June 1. Simpson was pressure-washing in preparation for Australian Quarantine Inspections, a mandatory inspection of all vehicles and equipment that must be passed before they can enter Australia in support of Exercise Talisman Sabre.