In the Galactic Civil War, most Imperial officers were verbally addressed as ”Commander” with the exception of Admirals, such as Admiral Kendal Ozzel and Piett who were addressed as ”Admiral”. By the next few years, the rank squares had become a much simpler collection of red and blue squares with the code cylinders still in use. In 0 BBY, Imperial officers of the Galactic Empire wore insignia consisting of a confusing collection of multi-colored rank squares on the left breast of the officer’s uniform with a combination of several metal cylinders to either side of the rank badge.