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Dear Ms. Smith,
Thank you for sharing your question with the History Hub.
The Textual Reference Branch at the National Archives in College Park, Maryland (Archives II) has custody of Record Group 127: Records of the United States Marine Corps. Military unit files among these records consist mostly of correspondence, operations reports, directives, histories, and journals. Because the files are arranged hierarchically, identification of the specific unit (i.e., division, regiment, and battalion) and dates of interest or names of battles/campaigns are necessary before a more specific search can be conducted.
Additionally, Record Group 127 includes muster rolls of Marine Corps units for WWII. During the war, the Marine Corps compiled multiple volumes of muster rolls for each month. Because the records are arranged by individual months, thereunder by unit name, we must search through many volumes of records for every month in question. Due to the fragility of the original records, we can only provide 35mm microfilm or DVD reproductions.
A general search of the National Archives Catalog yields several series which may contain information related to your search. For example, the series Records Relating to Public Affairs, the U.S. Marine Corps Reserve, and Historical Studies, which is part of RG 127, contains the file Papers from the 4th Marine Division. And the series Records of Ground Combat Units, Support Units and Other Commands, also from RG 127, includes several files like this one: Maui Marine Barracks War Diary, March 1946.
You can contact the Textual Reference Branch at Archives II if you have questions about these or similar records; the email address is Archives2reference@nara.gov.
For records in various non-textual media, you may want to contact the individual special media reference branches at Archives II for assistance. The majority of the National Archives’ photographic holdings, for example, are in the custody of the Still Pictures Branch (firstname.lastname@example.org). Maps, architectural drawings, and blueprints are usually in the custody of the Cartographic Branch (email@example.com), and films or audio recordings would be in the Motion Picture and Sound Recordings Branch (firstname.lastname@example.org).
You also expressed an interest in service records for the 4th Marine Division. Official Military Personnel Files (OMPFs) and medical records of officers and enlisted personnel of the U.S. Marine Corps who were separated from service after 1904 and prior to 1955 are located at NARA's National Personnel Records Center, (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. You can find out more here.
Finally, you may also wish to contact the Marine Corps History Division; their address is 3078 Upshur Avenue, Quantico, VA 22134.
Good luck with your ongoing research, and thank you, again, for posting your inquiry to the History Hub.