Dear Mr. Jenkins,
Thank you for posting your request on the History Hub!
It could be Medical Section No. 1 located at 257 2nd Street, Fort Belvoir, VA.
We searched the National Archives online catalog and located the Records of Historical Unit Medical Detachments (HUMEDS), 1940 - 1955 and the Unit Annual Reports, 1940 - 1949 in the Records of the Office of the Surgeon General (Army)(Record Group 112) that both contain copies of historical reports of Army medical units and facilities, as well as reports from medical components of regular Army units. For access to these records, please email the National Archives at College Park - Textual Reference (RDT2) at email@example.com.
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We hope this is helpful. Best of luck with your research!