Two regiments of African American soldiers served in Utah. One at Fort Duchesne and another at Fort Douglas. Lt. Col. Allensworth served in the regiment at Fort Douglas. For an excellent overview on Buffalo Soldiers stationed at Fort Douglas, check out the book chapter titled “Improbable Ambassadors” by Michael Clark in the edited volume Buffalo Soldiers in the West edited by Bruce Glasrud and Michael Searles
The YouTube video below provides a history of the regiment at Fort Duchesne.