Nigerian Navy

The Nigerian Navy (NN) is a branch of the Nigerian Armed Forces. It is the largest navies on the African continent, consisting of numerous thousand personnel, including those of the Coast Guard.
History.
The Nigerian Navy originated from the Nigerian Marine. Southern Nigerian Marine was formed in 1893. A Northern Nigeria Marine was formed in 1900. They merged in 1900.
Structure.
The NN currently has 9 Branches at the Naval Headquarters, 5 commands and a number of autonomous units.
The 5 commands are made up of 3 operational commands: 
There is also Training and Logistics Commands.
The Special Boat Service is a special operations unit of the Nigerian Navy. 
Nigerian Navy ships.
Nigerian Navy ships has four main departments: operations, marine engineering, weapon engineering, and logistics.