sentences:  In 1934, Hashimoto volunteered for the submarine service, and in 1937, he served aboard destroyers and submarine chasers off the shores of the Republic of China.On 15 November, as a sub-lieutenant, Hashimoto was assigned to the crew of the gunboat "Hozu", and was promoted to lieutenant on 1 December.During that time, his brother was killed in action fighting on the Chinese mainland.