CADILLAC â Simply put, it just wouldn't practical, either efficiency-wise or from a financial standpoint, to have a dedicated "on-call" ambulance stationed at the Colfax-Greenwood Fire Department. These are the cold, hard facts of the situation but they are no comfort for residents of Colfax and Greenwood townships, who worry that the absence of an on-call ambulance in the area will lead to longer response times and potentially lost lives. During a fire board meeting on Monday attended by residents, township officials, county officials and others, Jason MacDonald, vice president of operations for Mobile Medical Response, explained why the recent merger between MMR and Northflight EMS led to the removal of the ambulance at the Colfax-Greenwood Fire Department, which had been housing the unit there for several years as part of an arrangement with Northflight EMS.