Which position is in charge of a specific fire company on one shift?

The lieutenant is typically responsible for supervising the activities of their assigned fire company during a specific shift. This role involves direct oversight of personnel and operations on the scene, ensuring that tasks are performed correctly and safely. Lieutenants often act as a bridge between the crew members and higher-ranking officers, such as captains. They are tasked with managing daily operations, training, and sometimes administrative responsibilities specific to their company, making their position vital in maintaining effective fireground command.

Other ranks, like the captain, usually hold a broader command encompassing multiple companies or larger operational areas, while assistant chiefs and department chiefs are involved in higher levels of management and strategy that extend beyond a single shift or company.