186th Field Artillery Battalion
Greetings from NPRC St. Louis!
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It's a long shot but try this one:
Field Artillery Association
Post Office Box 33027
Fort Sill, Oklahoma 73503-0027
< firstname.lastname@example.org >
Perhaps they can direct you to the battalion veterans association (if one exists) and/or put you in touch with an old "gun bunny" or two who remembers him.