Okinawa was an Army campaign, under General Simon B. Buckner Jr., commander of the US Army's 10th Army. Iwo Jima was a Marine Corps campaign. However, Marines did fight on Okinawa; see the website "Battle of Okinawa", then look at the referrences at the bottom of the article for research material on the US Marines (at Okinawa).
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According to The US Army Medical Department there were over 20,000 Army medics in World War 2. If you want to know about the Navy Corpsman that served with the Marines you may have to contact the Navy. I could not find a total of Navy Corpsman who served in World War 2. Try the link I added below. Thanks.
You can find a list of those who served in the 77th infantry division in a book entitled, "Ours To Hold It High."
Find a veterans group of the same unit; That would be the quickest way.
You can get in touch with your local veterans administration as they have all information documented about our servicemen regardless of when they served. Be sure to have any DD214s (if applicable) to make it easier for them to research your request.