alternatehistory.com

As the tin says, Nimitz for whatever reason, decides MacArthur can make his own way to the Philippines and sends 1st Marine Division to grab Iwo Jima which is lightly held by 3,000 defenders, mostly IJAF personnel at this point in time.

So on September 15, 1st Marines land on and seize Iwo Jima within a few days.
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