Firefighters work a 24-hour shift and must supply their own food. They combine their money to purchase food for meals. Often, you will see them at a grocery store in a fire engine. The only way the Troy Fire Department can ensure that firefighters will respond and arrive in an average of less than 4 minutes is by using the vehicle they respond in -- with all the firefighters present and available. Sometimes they receive a call while shopping for food, which means they leave directly from the grocery store and must come back later to finish their grocery shopping.