I came across your posting while searching the Belser name.I do have the name Belser in my family tree, however I don't have a connection to the one you listed.Mine were in the New England states.
I wasn't sure if you had this information...or if this was the Joseph Belser that you have listed, but the age and location seemed right so I thought I'd send this along in case you didn't have it.
Database: Ohio Military Men, 1917-18
Name:Joseph E. Belser Serial Number:1532121 Race:W Residence:Bellefontaine, O. Enlistment Division:National Guard Enlistment Location:Columbus, O. Enlistment Date:08 May 1917 Birth Place:Galion, O. Birth Date / Age:22 1/12 Years Assigns Comment:Troop B 1 Cavalry ONG to 4 July 1917; Supply Company 134 Field Artillery to Discharge Sergeant 20 Aug 1917; 1 Sergeant 20 Aug 1917; Sergeant 4 July 1918; 1 Sergeant 16 Sept 1918. Defensive Sector. American Expeditionary Forces 28 June 1918 to 24 March 1919. Honorable discharge 10 Apr 1919. Volume #:2
Source Information: Ancestry.com. Ohio Military Men, 1917-1918 [database online]. Provo, Utah: MyFamily.com, Inc., 2000. Original data: Official Roster of Ohio Soldiers, Sailors and Marines in the World War, 1917-1918, Volumes I-XXIII. Columbus, OH: F. J. Heer Printing Co., 1926.