Upon the completion of his formal education, Ronan was enrolled in the Kree Public Accuser Corps, the main law enforcement body for the empire. Ronan did well and was steadily promoted. In a border incident, he stopped a fleet of Skrull ships from entering Kree space. As a result, he was made Supreme Accuser of the Kree Empire, making him responsible for enforcing the laws and decrees of the Kree, and second only to the Supreme Intelligence, and the Imperial Minister. As a proud member of the Kree aristocracy (blue-skinned Kree), he was not happy taking orders from the Supreme Intelligence. His attempt to cause a civil war was quickly halted, and he quickly returned to service.