<Tr> <Th> Fleet </Th> <Td> 2 amphibious tank landing ships 3 frigates 2 offshore patrol vessels 2 minesweepers 9 fast patrol boats 4 patrol cutters 4 corvettes 16 inshore patrol crafts </Td> </Tr> <Tr> <Th> Engagements </Th> <Td> Nigerian Civil War First Liberian Civil War Sierra Leone Civil War Conflict in the Niger Delta Boko Haram insurgency Northern Mali War Invasion of the Gambia </Td> </Tr> <Tr> <Th> Website </Th> <Td> http://www.navy.mil.ng/ </Td> </Tr> <Tr> <Th_colspan="2"> Commanders </Th> </Tr>

When was the nigerian navy brought out of the nigerian police force