you might find this collection interesting:
45 A resolution for the relief of Light Horsemen of the Choctaw Nation. Passed and approved November 5, 1884.
as an example.
search for “light”
there is also mention of jeff fulton in those papers as a school trustee.
page 254, volume 26 of the oklahoma chronicles has a reference to the lighthorsemen. you can probably get access to it through interlibrary loan. see your local public library for that.
many of the oklahoma chronicles can be accessed through the search and the volumes/pages.
several instances of jeff fulton’s name appear here, but not with the horsemen.
the choctaw tribe might have more information too. i don’t think they read the messageboard, so you would have to contact them directly.
bear in mind that they were a force for many years, so you might have to narrow down the possible years he served.
picture of 1893 choctaw lighthorsemen in this book, page 115
The Choctaws in Oklahoma: From Tribe to Nation, 1855-1970
By Clara Sue Kidwell
you can see it through google books.
and the oklahoma historical society might also be a good resource for you.
suzanne hamlet shatto