Dear Ms. Bartens,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series titled Draft Registration Cards, 1917-1918 in the Records of the Selective Service System (World War I) (Record Group 163) that are in the custody of the National Archives at Atlanta (RE-AT). Please contact RE-AT via email at firstname.lastname@example.org. They may know what the various markings indicate.
To seek the records of Elmer Hamilton, please begin by requesting a copy of his Official Military Personnel File (OMPF). OMPFs and individual medical reports for those who served in the U.S. Armed Forces and who were separated from the service prior to 1956 are in the custody of NARA’s National Personnel Records Center in St. Louis. In many cases where Army and Army Air Corps 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. Navy and Marine Corps OMPFs were not affected by the fire. 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 suggest that you review the Selective Service Act of 1917 and Selective Service Classifications websites for more information about the draft. You may also wish to search NARA’s website World War I Centennial for additional information about World War I.
We hope this is helpful. Best of luck with your family research!