You might be able to find more information about your Grandfather's military service by requesting this military service files.
Information about the regiment can be found in a number of sources, some of which are online such as here.
History 119th Infantry, 60th Brigade, 30th Division, U.S.A. : operations in Belgium and France, 1917-1919: https://archive.org/details/history119thinfaconw/page/n3
Your grandfather is listed on the following page.
I also found some things on Ancestry. Hopefully these load right.
Ora C Hughes in the U.S., Army Transport Service, Passenger Lists, 1910-1939
Name: Ora Hughes Birth Date: 6 Mar 1893 Death Date: 22 Feb 1980 SSN: XXXXXXX Enlistment Date 1: 22 Feb 1918 Release Date 1: 14 Apr 1919
Ora C Hughes in the U.S., World War I Draft Registration Cards, 1917-1918
Trying one more time with the World War I Draft Registration Cards, 1917-1918.
If the image doesn't work, the short version is that it shows that Ora C Hughes, born March 6, 1893, and living at Villa Ridge, Pulaski, Illinois, registered for the draft on June 5, 1917. He was single, listed his occupation as farming, listed his mother (no name given) as a dependent.
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Dear Ms. Smith,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Records of Divisions, 1917-1920 in the Records of the American Expeditionary Forces (World War I) (Record Group 120) that includes files of the 119th Infantry Regiment, 30th Division. We also located a series titled Records of the 1st Through 338th and the 559th Infantry Regiment, 1916-1921 in the Records of U.S. Regular Army Mobile Units (Record Group 391) that should include 119th. We were unable to locate specific records of Company G. Records of lower echelon units sometimes were incorporated into the files of the regiment. For access to and/or copies of these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
For information about his service, we suggest requesting a copy of his Official Military Personnel Files (OMPF). OMPFs and individual medical reports for enlisted men of the U.S. Army who were separated from the service after October 1912 and prior to 1955 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.
We hope this information is helpful. Best of luck with your family research!