Rainbow Reunions In Ohio

Sgt. Roy Bailey (right end) at reunion even circa 1940. What event? What's the "M" flag? Marion?

Reunion Materials: L-R, Top- Bottom: Progam for Ohio Rt 42, "Rainbow Veterans Memorial Highway" dedication, 1935 - Rainbow Veterans Annual Convention program, 1937, Rainbow Verterans ribbon (in homemade case), Book of Poems - undated, Rainbow Veterans Year Book 1938-1939, Ohio Rainbow Division Veterans Annual Reunion Program, Neil House, Columbus, OH, 1938