Which unit staffing includes an officer and three firefighters?

The correct answer involves understanding the typical compositions of fire department units. An engine company, commonly referred to when mentioning "Engine one," usually consists of a minimum staffing that typically includes an officer and three firefighters. This composition allows them to effectively operate the fire pump, manage hoses, and carry out rescues or suppression activities during fire emergencies.

In contrast, a rescue squad primarily focuses on rescue operations and may have different staffing numbers, often tailored to specific rescue scenarios. Truck companies are designed to assist with aerial operations and may have specific requirements for staffing as well. The term "support specialist" generally refers to specialized units that do not fit the standard firefighting tasks directly.

This structure ensures that engine companies are equipped to handle the primary demands of fire response in high-rise situations, effectively mitigating risks and ensuring safety for all involved.