Dear Mr. Manuel,
Thank you for posting your request on History Hub!
We suggest that you begin by requesting his Official Military Personnel Files (OMPF). OMPFs and individual medical reports for personnel U.S. Army who served during World War III and were separated prior to 1957 are in the custody of NARA's National Personnel Records Center in St. Louis. In many cases where personnel records were destroyed in the 1973 fire, proof of service can be provided from other records such as morning reports, payrolls, and military orders, and a certificate of military service will be issued. Please complete a GSA Standard Form 180 and mail it to NARA's National Personnel Records Center, (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. For more information see Official Military Personnel Files (OMPF), Archival Holdings.
We searched the National Archives Catalog and located multiple records relating to the Ledo Road, also known as the Stillwell Road. We also located World War II Operations Reports, 1940-1948 in the Records of the Adjutant General's Office, 1905-1981 (Record Group 407) and Unit Histories, 1943 - 1967 in the Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter) (Record Group 338) that may contain records of his unit. For more information about specific records, please email the reference unit listed as the contact in the Catalog description, or post a follow up question here on History Hub.
Also, our website has two pictures relating to the Ledo road on our Pictures of African Americans During World War II: Select Audiovisual Records page.
We also searched online and found multiple sources on the topic, to include the following:
We hope this information is helpful. Best of luck with your research!