The reserve apparatus in the department are ready reserve, meaning that they are fully stocked with standard equipment and can be pressed into service at any time. The personnel can then simply switch over to the reserve rigs. When in service, the apparatus will have the call sign of the apparatus it substituted. For example, if the frontline Truck 5 is in maintenance and Reserve Truck 501 is filling in, when a call comes in for Truck 5, the reserve truck will be called Truck 5. A rare occurrence for the reserve apparatus to be pressed into service happens when fire department resources are strained due to an unusually high number of calls, a large fire occurs in the city, a big event in the city, or a high risk of fire (wildland fire season). In this case, recall personnel (from various platoons) will fully staff the apparatus (up to 6 men per rig) and will be stationed in pre-designated stations to achieve minimum response time. The department currently owns four reserve apparatus: 2 engines and 2 trucks. See Station 1 and Station 2 for more details!