What is the ICS term for a group of fire fighters with an assigned leader who are working without an apparatus?

The term "Crew" is the correct answer as it refers specifically to a group of fire fighters who are organized under a leader and are engaged in operations without the support of an apparatus. In the context of the Incident Command System (ICS), a crew is typically composed of personnel that are assigned specific tasks and responsibilities during an operation, indicating that they are structured and have clear leadership.

This term emphasizes the operational aspect of fire fighting where crews are often deployed to execute specific missions or tasks, such as suppression activities or search and rescue operations, independently of any firefighting vehicle. A "crew" is known for its focus on teamwork and efficiency, which is essential in emergency situations where coordination among fire fighters is critical.

While the other options have their own meanings in the context of ICS, they do not imply the same structured operational group of fire fighters working under a designated leader and without apparatus. For example, a "Unit" may refer to a larger organizational component, while "Group" can denote a collective but may lack the specific leadership aspect implied by a crew. "Team" often suggests collaboration but generally does not have the designation within ICS that a crew does in terms of structured firefighting operations.