Firefighters from Chattanooga spray down one of two firefighter/paramedics who suited up for a hazardous materials exercise at Mercer Landmark in Chattanooga on Saturday morning. Barry Fennig of the Celina Fire Department and Todd Williams of the Rockford Fire Department - both trained hazmat technicians - donned the suits over several other layers of protective clothing before simulating a check of a large, leaking anhydrous ammonia tank.