The Anbu usually work in teams formed to the requirements of the mission, ensuring maximum success. The shinobi in the Anbu are hand-picked by the Kazekage, chosen for their individual capabilities and special skills. Age, gender, background, or previous rank bear no weight in this decision. There are apparently no true ranks within the Anbu, unlike within the regular forces. Team leadership and hierarchy seem to be based on merit and experience. The leaders of the teams in Sunagakure are called , a position held in high regard.