Dear Mr. Collins,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Command Reports, 1949 - 1954 in the Records of the Adjutant General's Office, 1917 - 1985 (Record Group 407) that includes the file unit 602-TK - 64th Heavy Tank Battalion (Formerly 758th Heavy Tank Battalion), 2nd Armored Division: Historical Narrative, 1949 during the Korean War. For more information about these non-digitized records, please contact the National Archives at College Park - Textual Reference (RDT2) at firstname.lastname@example.org. The 758th was re-designated as the 64th Heavy Tank Battalion from 1949 to 1957, and there are additional file units if you search for that, such as 303-TK - 3rd Infantry Division, 64th Heavy Tank Company: Command Reports (12 folders), 01/1951 - 12/1951 from the same Record Group and series.
In addition to this, you might also want to look at the National Archives Access to Archival Databases (AAD). Click on “Korean War” under the category section. A list of the databases relating to the Korean War will appear, including Records of Military Personnel Who Died as a Result of Hostilities and Records on Korean War Dead and Wounded Army Casualties. Since research rooms at the National Archives nationwide are currently closed to the public, accessing these databases may be a good place to start your research.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful! Best of luck with your research!