The Imperial Center Guard was an organization that existed by 2 ABY. Swart Swifto served as a trainer for the Grand Army of the Republic and later for the Imperial Center Guard. In 2 ABY, the Imperial Center Guard was mentioned in an interview with Swifto by Eschul Shaywa of Imperial Center Today[1]
Sources
Star Wars: The Essential Guide to Warfare Author's Cut, Part 2 - Ancient Coruscant on StarWars.com (backup link) (First mentioned)
