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Dear Mr. Wells,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 9 series of Marine Corps records that contain information about Okinawa during WWII. One series in particular titled Records Relating to United States Marine Corps Operations in World War II, 1939 - 1949 includes 49 boxes (Boxes 247-295) of unit records for operations in Okinawa.
For access to these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
We hope this is helpful. Best of luck with your research!