The Iotran Guard was a military division made up of Iotrans that served the Muuns and the InterGalactic Banking Clans Collections and Security Division. One duty of the guard was to maintain order on High Port, a city orbiting Muunilinst, which they had done for most of the planets history.
During the Clone Wars, Riklon Tost served as captain of the guard. Tost helped Chairman San Hill escape from Geonosis, later commanding Hailfire droids in many battles. He was allowed in the Banking Clan's inner ranks despite not being a Muun.
After the fall of the Republic, the Galactic Empire disbanded the Iotran Guard and took over most of the High Port's operations, including its security.