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.
One particular member of the guard named Riklon Tost was a captain who helped Chairman San Hill escape from Geonosis and commanded Hailfire droids in many battles during the Clone Wars. He was allowed in the Banking Clan's inner ranks despite not being a Muun.
After the fall of the Republic, Imperials disbanded the Iotran Guard and took over security and most of the High Port's operations.