Which rank is directly below Lieutenant?

The rank that is directly below Lieutenant is Driver Operator. In many fire service organizational structures, the rank of Lieutenant typically oversees a team or company, which may comprise various personnel, including Driver Operators. The Driver Operator usually holds a role that includes driving the fire apparatus and assisting in the operation of equipment during emergency responses. This position is distinct from the higher rank of Captain, which entails more significant leadership responsibilities and oversight over multiple Lieutenants or units. Understanding this hierarchical structure is crucial for comprehending the roles and responsibilities within the fire service.