Answer:
Battle of Okinawa.
Step-by-step explanation:
The Battle of Okinawa resulted in the highest casualties for the United States and Japan. This battle, codenamed Operation Iceberg was fought in the Japanese Island of Okinawa. The initial invasion took place on April 1, 1945, and the battle lasted 82 days, until June 22, 1945. The battle was particularly significant because of the ferocity of the attacks, the intensity of the kamikaze attacks and the number of casualties.