Probably the most famous soldier at Fort Riley was George Armstrong Custer who met his fate at the Battle of the Little Big Horn.
"In 1866, when the U.S. 7th Cavalry Regiment was created at Fort Riley, Kansas, Custer was promoted to the position of Lieutenant Colonel of the regiment. The first Colonel of the 7th was Colonel Andrew Smith, (1866-1869) and the second Colonel was Colonel Samuel Sturgis (1869-1886). Colonel Smith and Colonel Sturgis were usually on detached service which placed Custer in command of the Regiment until his death on June 25th, 1876."
By the way - Sturgis, South Dakota, noted for its yearly motorcycle rally, was named for Colonel (soon to become General) Sturgis.
Ahhh, wt1, interesting observation. Whereas "troup" does mean a collection of individuals for some common theme, the military spelling is "troop". Maybe two different authors - one for the writeup and one for the short wording on the front?