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San Diego Fire-Rescue firefighter-paramedic Dave Stepp, left, and firefighter Tim Hill run from a medical to their fire engine after the ambulance arrived and they received another call. Firefighters are often the first responders to 911 calls, providing emergency care before ambulances arrive. Engine 7 had a total of 2,301 calls in 2010, 1,896 of which were medical or rescue calls, according to the City of San Diego.