Kuroumi

The "Kuroumi", meaning "Black Sea", is a Marine unit of Special Ops under the command of Hale Osiris. The unit's purpose is to deal with high profile and classified operations, but were mainly created for the purpose of taking down, eliminating or capturing defectors from the World Government and the Marines.

Overview
Becoming a defector of the Marines has become quite popular in recent history, as an increasing number of criminals are still roaming around after being part of the Government. This has caused a lot of problems, as they have not only been trained in the effective martial arts of the World Government, they may also possess crucial information that may lead to potential disasters in the future.

Enter the "Kuroumi", a unit dedicated to hunting down these individuals. In order to become a member, a Marine soldier must at least hold the rank of Captain, and have knowledge of "Haki". After a series of tests, if the recruit is admitted to the unit, they'll commence training after being paired up with a partner. This is the way the Kuroumi works, each pair has been set up to accommodate the members's weaknesses and strengths, in order to effectively execute their missions.

After a recruit becomes an official member, they also get their rank "frozen", as even though they operate for and with the Marines, their duties differ and are actually treated as a separate unit. So the members still maintain the rank they entered the organization with.

Strength and Organization
The members of the unit are given further specialized training, as they have to be able to track down, capture or defeat high profile targets. Whether by implementing Rokushiki or Haki, it is required that each member individually holds their own with high-level targets, and then, by combining their already great battle prowess with a partner, they must learn to coordinate attacks and abilities in a way that may give the impression that both have their minds linked to one another.

Apart from physical training, they receive training in various other fields, in order for them to quickly adapt to any environment in just a few seconds.

The Kuroumi is commanded by Vice Admiral Hale Osiris. They do not have a hierarchy among the units, other than Hale Osiris as their commanding officer. However, in most cases they are appointed as commanders over a Battle Ship or a squadron of Marines.