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Dear Mr. Gabriel,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Records Relating to the History of the War Department, 1918 - 1941 in the Records of the War Department General and Special Staffs, 1860-1952 (Record Group 165). It includes a history, station list, monthly operation reports, and summary of operations of the 14th Balloon Company during WWI (Box 267). We also located a series titled World War I Strength Returns, ca. 1917-1939 in the Records of the Adjutant General's Office, 1905-1981 (Record Group 407) that includes the 14th Balloon Company (Box 541). We were unable to locate records for the 14th Balloon Corps.
For access to these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
We hope this information is helpful. Best of luck with your family research!