Dennis Mayfield remembers going to the first organizational meeting for North Warren Fire Department in 1974.The volunteer fire department would open its first fire hall in September of that year using a borrowed firetruck and renting two bays from a service station to serve as its headquarters. Some 39 years later, after fighting what he estimates to be hundreds of fires, Mayfield has decided it’s time to step aside. With his retirement in June, North Warren Fire Department lost its last charter member.“It was my life for a long time and something I loved doing,” said Mayfield, who was honored earlier this month for his years of service.