As the Stormtrooper Corps has a unique and segregate chain of command that goes straight to the Emperor, the courtesies they render differ from that of other military organizations. Indoctrinated they only have loyalty to the Emperor and obey his commands, the Stormtrooper Corps courtesies offered reinforce that sense of detachment from other military units within the Empire. This generally leads to friction between branches, from time to time, that many would argue is intentional by design.