The costliest battle in the history of the United States Marines Corps was the Battle of

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The Battle of Iwo Jima, which took place from February 19 to March 26, 1945, was the costliest battle in the history of the United States Marine Corps. The battle resulted in approximately 27,000 American casualties, including 6,800 deaths. The island of Iwo Jima was strategically important for the American forces as it allowed them to have a staging area for attacks on Japan's mainland.

The Costliest Battle in the History of the United States