The series contains original affidavits of registration that record personal information about each registrant, their photograph affixed to the majority of documents, and the registrants fingerprints. All of these are specific to Kansas, and most have the actual documents attached.
Compiled military service records for 1,235 Rough Riders, including Teddy Roosevelt have been digitized. The records include individual jackets which give the name, organization, and rank of each soldier. They contain cards on which information from original records relating to the military service of the individual has been copied. Included in the main jacket are carded medical records, other documents which give personal information, and the description of the record from which the information was obtained.