Background
Mineichi Koga was born in the famous ceramics center of Arita in Nishimatsuura County of Saga Prefecture in 1885.
Mineichi Koga was born in the famous ceramics center of Arita in Nishimatsuura County of Saga Prefecture in 1885.
He entered the 34th class of the Imperial Japanese Naval Academy and graduated in 1906, ranked 14th of 176 cadets.
As a midshipman on the cruiser Matsushima, Mineichi Koga visited various countries in or bordering the Pacific Ocean, including United States (Hawaii), New Zealand, Australia, Dutch East Indies, China, and Korea. He was promoted to the rank of lieutenant in 1911. Upon completing the Naval War College courses, he was promoted to the rank of lieutenant commander and subsequently held several shore staff positions.
Mineichi Koga saw no action during WW1. In 1920, he was posted to France for two years. Upon his return, he was named the executive officer of Kitakami. On 1 December 1926, Mineichi Koga was promoted to the rank of captain. He would return to France as a naval attaché until being recalled in 1930 to serve as the commanding officer of the Yokosuka Naval Station. On 31 December 1930, Mineichi Koga was named the commanding officer of heavy cruiser Aoba. On 31 December 1931, Mineichi was named the commanding officer of battleship Ise. On 31 December 1932, he was promoted to the rank of rear admiral. He was named the head of the Intelligence Division of the Navy General Staff in 1933. On 31 December 1936, Mineichi Koga was promoted to the rank of vice admiral.
After the war began, Koga was named the commanding officer of the 2nd Fleet in 1939. On 1 September 1941, Mineichi Koga was the head of the China Area Fleet. At the onset of the Pacific War between 9 and 31 Dec 1941, he commanded naval operations in support of the invasion of Hong Kong. After Admiral Isoroku Yamamoto's death in Apr 1943, Koga was named as the new commander-in-chief of the Combined Fleet on 21 May 1943, breaking his flag aboard battleship Musashi. He initially planned aggressive operations in order to give the Japanese Navy the offensive initiative again, but as naval aviation forces dwindled, he could only maintain his forces in a defensive posture, hoping to force a decisive engagement as the Americans conducted their next attack.
In March 1944, during Combined Fleet's withdrawal from Palau Islands to the Philippine Islands, the flying boat which Koga was aboard crashed into the sea during a typhoon. His death was not made public until May 1944 due to war time censorship reasons. He now rests at the Tama Reien Cemetery near Tokyo, Japan.