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Dear Mr. Schneider,
Thank you for posting your request on History Hub!
We searched the series Files of the Military Historian, 1946 - 1963 for the Fifth Army in RG 338. The two FRC boxes contain the following: Box 1 -- Arranged roughly by unit and includes mostly published histories for WWII; Box 2 -- Arranged by War Department Decimal File System and includes Decimals 220.3 to 230.36 for 1955 and 4th Service Command files for 1946 with Decimals 220.3 to 361 (none for Decimals 322 or 326).
We hope this information is helpful.