With nearly 80,000 US military casualties, why is the Battle of Okinawa the deadliest in the Pacific War?

With nearly 80,000 US military casualties, why is the Battle of Okinawa the deadliest in the Pacific War?
The Japanese set up an extremely tight defense system on the island of Okinawa

so what are the underlying reasons behind the heavy casualties in the Battle of Okinawa?

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