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Dear Mr. Schneider,
Thank you for posting your request on History Hub!
We searched the Records of the Adjutant General, 1946 - 1963 in RG 338 for the Fifth Army and located 374 cubic foot boxes. The majority of the series consists of a decimal file that is arranged by year (1951 through 1958) and thereunder, according to the War Department Decimal File System. The decimal for general orders is 300.4 and, according to the information on the outside of the boxes, may be located in the following boxes: 1951 (Box 3), 1952 (Box 27), 1953 (Box 67); 1954 (Box 118), 1955 (Box 174), 1956 (Box 216), 1957 (Box 255), and 1958 (Box 283).
The staff of the National Archives at College Park - Textual Reference (RDT2) will be pleased to assist you or your representative in the Textual Research Room located 8601 Adelphi Road, College Park, MD, near the University of Maryland--College Park campus. Textual Research Room (Room 2000) hours are 8:45 a.m. to 5:45 p.m. Monday through Friday, except legal holidays. The RDT2 consultation room hours are 8:45 a.m. to 4:00 p.m., Monday through Friday, except legal holidays. No appointment is necessary. Prior to your visit, please consult College Park websites at https://www.archives.gov/dc-metro/college-park/, https://www.archives.gov/dc-metro/self-service-copying.html, and https://www.archives.gov/research/start/getting-started.pdf.
We hope this is helpful. Best of luck with your research!
Thank you Rebecca for the information.