Anbu: The Anbu are covert operatives of capable ninja that are dispatched by their village leader. In Konoha, they originally served directly under the Hokage and are picked from the skilled shinobi. There are apparently no true ranks within the Anbu; team leadership and hierarchy seem to be based on merit and experience, and skill levels from genin to jonin are found in the Anbu. The leaders of the teams are called squad leaders, a position held in high regard. There are various groups within the Anbu, aimed at various different functions and tasks. Kirigakure, for instance, has the hunter-nin — a group created solely for hunting down and disposing of missing-nin. Konohagakure has the Konoha Torture and Interrogation Force, who interrogate prisoners and work to gather intelligence.
Medical Team: The medical teams is the supporting side of the shinobi forces. They consist of medical-nin, working behind the scenes to heal sick and injured shinobi and to make sure the organisation's resources are always in peak condition. Medical-nin are similar to a Hospital Corpsman or HM of the military in real life. They also do extensive research into new techniques, medicines, diseases and the human body. Although not seen very often, they are highly respected. Even to a jōnin, the advanced skills of these shinobi seem like magic. Each member has mastered advanced medical ninjutsu, and play important roles in protecting lives.
Not all medical-nin are members of the medical teams, though. There are also medical-nin within the regular forces, who go along on standard missions to increase the success-rate referred to as field medical-nin. Though medical-nin from the hospital are sent out into the fields from time to time. However, back in the village, it is the medical teams who run the hospital and treat the wounded.

Genin: Genin are the lowest level of ninja and also the ones that display the most difference in power. When they become genin, ninja start to do their bit for their village's economy – being sent on missions that the village gets paid for. They are typically sent either on D-rank missions, which are almost entirely risk-free jobs of manual labour, or, rarely, on C-rank missions, which are a cut above that and begin to verge on real "ninja" work that have a very low possibility of risk to the ninja involved.
Chūnin: Chūnin are ninja who have reached a level of maturity and ability that primarily consists of leadership skills and tactical prowess. Chūnin are typically sent on C-rank or B-rank missions. Some chūnin, move on to become Academy teachers.
Tokubetsu Jōnin: Tokubetsu Jōnin are ninja who, rather than having all-around jōnin skills, only excel in a specific area or skill, much like warrant officers in real-world militaries.
Jōnin: Jōnin are generally highly experienced and highly skilled shinobi who serve as military captains, whose abilities are considered superhuman. Jōnin are generally able to use at least two types of elemental chakra. It is not unusual for jōnin to go on missions alone. They are often sent on A-rank missions, and if experienced enough, S-rank missions as well which are considered to be the greatest difficulty.
Kage: Kage is a title reserved for the leader of one of the Five Great Shinobi Countries' hidden villages. They are collectively known as the Five Kage. A Kage oversees the activities of their village, from sending ninja on missions to making the hard decisions regarding the safety of their people. A village's Kage is generally acknowledged as its most powerful ninja.

Although there are variations from village to village, the general organisational structure and hierarchy of the ninja systems of each village is about the same. At the top of the organisation is the village head, or the Kage in the case of the Five Great Shinobi Countries. They rule the village and its shinobi together with a council, usually consisting of highly ranked shinobi and elders. The actual shinobi forces are divided in three groups. The regular forces, the Anbu, and the medical teams.
The regular forces form the foundation of the village and its shinobi system. The majority of shinobi are a part of these forces and together, either individually or in teams, they perform the majority of the missions the village receives. They are also tasked with the various duties within the organisation, such as training and administrative duties. When an Academy student graduates, they usually become a part of these forces, assuming the rank of genin. Via various exams and tests, they can be promoted to higher ranks, first to chūnin and jōnin after that. Sometimes, when a shinobi is specialised in a very specific skill, they can assume the rank of tokubetsu jōnin, which is a rank between chūnin and jōnin.
The Anbu, short for Ansatsu Senjutsu Tokushu Butai, are covert operatives of capable ninja that are dispatched by their village leader.
The medical teams is the supporting side of the shinobi forces. They consist of medical-nin, working behind the scenes to heal sick and injured shinobi and to make sure the organisation's resources are always in peak condition. They also do extensive research into new techniques, medicines, diseases and the human body. Although not seen very often, they are highly respected. Even to a jōnin, the advanced skills of these shinobi seem like magic. Each member has mastered advanced medical ninjutsu, and play important roles in protecting lives.

The Five Great Shinobi Countries are the world's five largest countries. These countries are led by governmental leaders known as daimyō, who are in charge of ruling their individual nations solely through a monarch-like government. These countries are divided equally on an unknown continent to create balance in the Shinobi world. They are the Land of Earth in the Northwest, the Land of Lightning in the Northeast, the Land of Water in the East, the Land of Wind in the Southwest, and the Land of Fire in the centre. The countries are named after the dominant chakra nature of each of the areas. These superpowers are the major players in the politics and trade between the shinobi nations. They are the most powerful of all nations and each has an extremely powerful shinobi village. The Land of Earth has Iwagakure, the Land of Lightning has Kumogakure, the Land of Water has Kirigakure, the Land of Wind has Sunagakure, and the Land of Fire has Konohagakure. These five villages are the only ones to have a Kage as the village head.

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