Jaan Usin VR II/3  was an Estonian Navy commander.

He served during World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 in the Imperial Russian Navy as an ensign. In 1918, he entered in the Estonian service and participated in the Estonian War of Liberation. Since 1920, Jaan Usin was commander of the Peipsi flotilla in Tartu

Tartu

Tartu is the second largest city of Estonia. In contrast to Estonia's political and financial capital Tallinn, Tartu is often considered the intellectual and cultural hub, especially since it is home to Estonia's oldest and most renowned university. Situated 186 km southeast of Tallinn, the...

. He rose in ranks and was finally, in 1940, promoted to Captain, being then commander of one gunboat, one motorboat and 49 men. During the Soviet occupation he was prisoned for some time but after the outbreak of World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

he was engaged in the Soviet navy as steersman of the icebreaker Merikaru. He was sunk on board Merikaru in the Muhu strait.