Dear Ms. Cowell,
Thank you for posting your request on History Hub!
We searched the press releases available online from the U.S. Marine Corps website, and we identified 2 potentially relevant press releases from 2015-present that may be of interest to you. You may be able to locate additional relevant information on their website. We suggest that you contact the Marine Corps Communication Directorate for further assistance.
Next, the Department of Defense news release DOD Identifies Marine Corps, Navy and Army Casualties (08/28/2021) includes additional contact information that may be useful.
Finally, the History Division of the Marine Corps University provides some online information about Marine Corps Casualties 1775-2016. We suggest that you contact them directly for more information.
We hope this is helpful. Best of luck with your research!