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Dear Mr. Schneider,
Thank you for posting your request on History Hub!
We searched the series Organization Histories, 1962 - 1980 in RG 319 and located the file unit Fifth United States Army - 1976 in Box 6. The history is for the Fifth Army Headquarters while stationed at Fort Sam Houston, TX in 1976 ONLY. No additional histories or file units were located for the Fifth Army.
We hope this information is helpful.