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Dear Mr. Smith,
Thank you for contacting the History Hub!
We searched the Records of the American Expeditionary Forces (World War I) (Record Group 120) and the Records of the War Department General and Special Staffs (Record Group 165) and located records about liaisons during WWI (see https://catalog.archives.gov/search?q=Liaison&f.oldScope=(descriptions%20or%20online)&f.recordGroupNoCollectionId=165&SearchType=advanced&f.dateRangeFacet=%221910%20-%201919%22 and https://catalog.archives.gov/search?q=Liaison&f.oldScope=(descriptions%20or%20online)&f.recordGroupNoCollectionId=120&SearchType=advanced). For more information about these records and how to order copies, please contact the Textual Reference Archives II Branch (RDT2) via email at firstname.lastname@example.org.
We hope this information is helpful. Best of luck with your research!