Final answer:
The firefighting position that involves leading and working on different types of crews is the Fire Chief or Fire Captain position.
Step-by-step explanation:
The firefighting position that involves leading and working on different types of crews is the Fire Chief or Fire Captain position. Fire Chiefs or Fire Captains are responsible for overseeing and managing firefighting operations, including leading and coordinating crews during emergency situations. They ensure that crews are trained, equipped, and prepared to respond to various types of incidents, and they also make decisions and provide direction to control and extinguish fires.