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Dear Mr. Yorke,
Thank you for posting your request on History Hub!
Please submit a request for his files in the series U.S. Army File of the Mexican Border Service, 1916-1917. It is necessary to include which State National Guard the man was with such as Nevada or his state of residence. These files contain rank and unit designations. To request this file, please contact the National Archives at St. Louis (RL-SL) via email at firstname.lastname@example.org.
You also may request to see if he served in the U.S. Army by requesting an Official Military Personnel File from the National Personnel Records Center by submitting a completed SF-180.
We hope this information has been helpful and good luck with your research!