For about three years the city of Cedar Falls has begun using dual-trained public safety officers — PSOs — to help fight fires. There has been push back. Now two veteran firefighters have quit the force. James Cook worked as a full-time firefighter in Cedar Falls for 12 years, but left this month due to safety concerns. He’ll take a $20,000 pay cut to work as a firefighter in the Des Moines metro area. Firefighter Shane Farmer also resigned and reportedly plans to move out of state. Cook had worked in emergency services since 1986 and for 10 years was president of Cedar Falls Firefighters Association, the union representing firefighters. Cook said he left because he no longer feels the Cedar Falls Fire Department provides the safe service people of Cedar Falls deserve.