Heliport, where did you get that photo, and when??? That's the very machine that I'm on right now!!!
Nice pic.
Helmet fire, good answer. Everyone at Superior, Erickson, and other large medium/heavy operators value the use of light and medium helicopters. No one type can efficiently handle a fire on their own, if all can work together, the fire can be controlled quicker, and at less cost.
Volume of water is important in a drop on a large fire, as any misting in the drop will evaporate before it reaches the ground.