Special forces, tasked by the Council with difficult missions, or mission of questionable morality. Short of treason they are given permission to do what is needed.
Varies, per species. Few actively wear any uniform, but all have a badge showing their rank. Said badge becomes useless when they die.
Founded in the early years of the Alliance. They worked to deal with territorial disputes and dealing with espionage from other Star Empires.
At present, most are Morgans, to the point that they are the face of the organization.