Final answer:
Helicopters will remain vital for rescues into the 21st century, demonstrated by services like the Auckland Westpac Rescue Helicopter Service. They store rotational kinetic energy in their blades, which is key for their operation.
Step-by-step explanation:
The helicopter has been an essential tool for rescue operations and continues to be vital into the 21st century and the foreseeable future. They have saved countless lives, as demonstrated by the Auckland Westpac Rescue Helicopter Service, which started its rescue operations in 1973 and has saved over 50,000 lives since.
Helicopters are able to store large amounts of rotational kinetic energy in their blades, which is crucial for lift and flight, showcasing their engineering complexity and the importance of their maintenance for effective rescue missions.