Privateers

Privateers (プライベーティア) are a type of mercenary employed by the Russian army as deniable military units to carry dirty and illegal works for Russia.

Etymology
As part of naval warfare, from the 16th to the 19th century, s were pirates authorized by a nation's government to attack foreign shipping, entitled by their state to attack and rob enemy vessels during wartime in order to cause economical damage. Some were so successful, like the famous Sir Francis Drake, that they were knighted.

Duties
They are "blank" units, with no official members.

World War III
The privateers attack the village Hamazura Shiage and Takitsubo Rikou are hiding in and they help the villagers defend themselves.