Final answer:
The primary responsibility of the first due Engine & Truck on a METRO incident is to establish a water supply and initiate fire suppression operations. They also perform search and rescue and ventilation tasks.
Step-by-step explanation:
The primary responsibility of the first due Engine & Truck on a METRO (Major Emergency Tactical Response Operation) incident is to establish a water supply and initiate fire suppression operations. The Engine company is responsible for connecting to a water source, such as a fire hydrant, and supplying water to the firefighters working on the fire. The Truck company is responsible for performing search and rescue operations, ventilation, and other tasks to support the firefighting efforts.
For example, when the first due Engine arrives at the scene, they may stretch a hose line from the fire hydrant to establish a water supply. Meanwhile, the first due Truck may enter the building to search for any occupants who may be trapped or perform ventilation to remove smoke and heat from the structure.
In summary, the primary responsibility of the first due Engine & Truck on a METRO incident is to establish a water supply and initiate fire suppression operations, as well as perform search and rescue and ventilation tasks respectively.