Umibozu Unit

The 23rd Special Operations Sentai, popularly known as the Umibozu Unit and also known as the Imperial Navy TokuSa, is a special operations unit of the Yamatai Imperial Navy. The Umibozu Unit is a part of the Imperial Navy Special Operations Command, and comprises of five kumi of special forces teams. Widely considered to be among the top special forces units in the Yamataian military, the Umibozu Unit has a global reputation as a highly successful special forces unit.

Umibozu operatives are trained to operate in all environments, ranging from sea, air and land. Their main functions are conducting small-unit maritime military operations that originate from, and return to, a river, ocean, swamp, delta, or coastline. Umibozu teams are typically ordered to capture or to eliminate high level targets, or to gather intelligence behind enemy lines.

History
While the modern Umibozu Unit was officially founded in 1962, the group's origins date back to the Second Escar-Varunan War, with roots in the Imperial Navy Special Naval Landing Force's Raid Divers Team. This was a special unit of frogmen trained in underwater demolitions and infiltration, tasked with attacking enemy harbours after being inserted by midget submarines. The Raid Divers were extremely successful in all theatres of the Second Escar-Varunan War, with their most famous attack being the attack on Wanshu's port on 23rd September 1944, sinking several transport ships in the port that were carrying vehicles and ammunition destined for the fighting on Hinomoto.

Organisation
The Umibozu Unit is a Sentai-sized force organised into five kumi. Each kumi is further divided into 3 squads of 12 men each, though when deploying Umibozu often deploy in however few numbers required by the mission.